diff --git a/README.md b/README.md
index bc93d65..5d016d7 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 ![](docs/images/go-http-leaflet-protomaps-sfo.png)
 
-`go-http-protomaps` is an HTTP middleware package for including Protomaps.js (v0.3.3) assets in web applications.
+`go-http-protomaps` is an HTTP middleware package for including Protomaps.js (v0.3.5) assets in web applications.
 
 ## Documentation
 
diff --git a/static/javascript/protomaps.js b/static/javascript/protomaps.js
index 680d099..e5315a8 100644
--- a/static/javascript/protomaps.js
+++ b/static/javascript/protomaps.js
@@ -2914,7 +2914,7 @@ var protomaps = (() => {
         ctx.rotate(Math.atan2(dy, dx));
         if (dx < 0)
           ctx.scale(0, -1);
-        ctx.font = this.font;
+        ctx.font = font;
         if (this.stroke > 0) {
           ctx.strokeStyle = this.stroke;
           ctx.lineWidth = this.width;
@@ -3274,12 +3274,6 @@ var protomaps = (() => {
           font: "italic 400 12px sans-serif"
         })
       },
-      {
-        dataLayer: "roads",
-        symbolizer: new LineLabelSymbolizer({
-          fill: params.roadsLabel
-        })
-      },
       {
         dataLayer: "pois",
         symbolizer: new TextSymbolizer({
@@ -3751,10 +3745,18 @@ var protomaps = (() => {
     return new Promise((resolve, reject) => {
       let img = new Image();
       img.onload = () => resolve(img);
-      img.onerror = reject;
+      img.onerror = () => reject("Invalid SVG");
       img.src = src;
     });
   };
+  var MISSING = `
+<svg width="20px" height="20px" viewBox="0 0 50 50" version="1.1" xmlns="http://www.w3.org/2000/svg">
+    <rect width="50" height="50" fill="#cccccc"/>
+    <g transform="translate(5,5)">
+        <path fill="none" stroke="#666666" stroke-width="7" d="m11,12a8.5,8 0 1,1 17,0q0,4-4,6t-4.5,4.5-.4,4v.2m0,3v7"/>
+    </g>
+</svg>
+`;
   var Protosprites = class {
     constructor(src) {
       this.src = src;
@@ -3771,9 +3773,13 @@ var protomaps = (() => {
         let tree = new window.DOMParser().parseFromString(src, "text/html");
         let icons = tree.body.children;
         this.mapping = {};
-        let boxes = [];
+        let missingImg = yield mkimg("data:image/svg+xml;base64," + btoa(MISSING));
+        let boxes = [
+          {w: missingImg.width * scale, h: missingImg.height * scale, img: missingImg}
+        ];
+        let serializer = new XMLSerializer();
         for (let ps of icons) {
-          var svg64 = btoa(new XMLSerializer().serializeToString(ps));
+          var svg64 = btoa(serializer.serializeToString(ps));
           var image64 = "data:image/svg+xml;base64," + svg64;
           let img = yield mkimg(image64);
           boxes.push({w: img.width * scale, h: img.height * scale, img, id: ps.id});
@@ -3785,7 +3791,10 @@ var protomaps = (() => {
         let ctx = this.canvas.getContext("2d");
         for (let box of boxes) {
           ctx.drawImage(box.img, box.x, box.y, box.w, box.h);
-          this.mapping[box.id] = {x: box.x, y: box.y, w: box.w, h: box.h};
+          if (box.id)
+            this.mapping[box.id] = {x: box.x, y: box.y, w: box.w, h: box.h};
+          else
+            this.missingBox = {x: box.x, y: box.y, w: box.w, h: box.h};
         }
         return this;
       });
@@ -3793,7 +3802,7 @@ var protomaps = (() => {
     get(name) {
       let result = this.mapping[name];
       if (!result)
-        throw new Error(name + " not found");
+        result = this.missingBox;
       result.canvas = this.canvas;
       return result;
     }
diff --git a/static/javascript/protomaps.min.js b/static/javascript/protomaps.min.js
index 178319a..3ce1688 100644
--- a/static/javascript/protomaps.min.js
+++ b/static/javascript/protomaps.min.js
@@ -1,2 +1,9 @@
-var protomaps=(()=>{var Ye=Object.create,st=Object.defineProperty,Ie=Object.getPrototypeOf,Ae=Object.prototype.hasOwnProperty,Ue=Object.getOwnPropertyNames,Ze=Object.getOwnPropertyDescriptor;var qe=(e,t,i)=>t in e?st(e,t,{enumerable:!0,configurable:!0,writable:!0,value:i}):e[t]=i;var We=e=>st(e,"__esModule",{value:!0});var E=(e,t)=>()=>(t||(t={exports:{}},e(t.exports,t)),t.exports),Oe=(e,t)=>{for(var i in t)st(e,i,{get:t[i],enumerable:!0})},je=(e,t,i)=>{if(t&&typeof t=="object"||typeof t=="function")for(let r of Ue(t))!Ae.call(e,r)&&r!=="default"&&st(e,r,{get:()=>t[r],enumerable:!(i=Ze(t,r))||i.enumerable});return e},Y=e=>je(We(st(e!=null?Ye(Ie(e)):{},"default",e&&e.__esModule&&"default"in e?{get:()=>e.default,enumerable:!0}:{value:e,enumerable:!0})),e);var $=(e,t,i)=>(qe(e,typeof t!="symbol"?t+"":t,i),i);var C=(e,t,i)=>new Promise((r,n)=>{var s=l=>{try{o(i.next(l))}catch(u){n(u)}},a=l=>{try{o(i.throw(l))}catch(u){n(u)}},o=l=>l.done?r(l.value):Promise.resolve(l.value).then(s,a);o((i=i.apply(e,t)).next())});var Q=E((Xi,te)=>{"use strict";te.exports=H;function H(e,t){this.x=e,this.y=t}H.prototype={clone:function(){return new H(this.x,this.y)},add:function(e){return this.clone()._add(e)},sub:function(e){return this.clone()._sub(e)},multByPoint:function(e){return this.clone()._multByPoint(e)},divByPoint:function(e){return this.clone()._divByPoint(e)},mult:function(e){return this.clone()._mult(e)},div:function(e){return this.clone()._div(e)},rotate:function(e){return this.clone()._rotate(e)},rotateAround:function(e,t){return this.clone()._rotateAround(e,t)},matMult:function(e){return this.clone()._matMult(e)},unit:function(){return this.clone()._unit()},perp:function(){return this.clone()._perp()},round:function(){return this.clone()._round()},mag:function(){return Math.sqrt(this.x*this.x+this.y*this.y)},equals:function(e){return this.x===e.x&&this.y===e.y},dist:function(e){return Math.sqrt(this.distSqr(e))},distSqr:function(e){var t=e.x-this.x,i=e.y-this.y;return t*t+i*i},angle:function(){return Math.atan2(this.y,this.x)},angleTo:function(e){return Math.atan2(this.y-e.y,this.x-e.x)},angleWith:function(e){return this.angleWithSep(e.x,e.y)},angleWithSep:function(e,t){return Math.atan2(this.x*t-this.y*e,this.x*e+this.y*t)},_matMult:function(e){var t=e[0]*this.x+e[1]*this.y,i=e[2]*this.x+e[3]*this.y;return this.x=t,this.y=i,this},_add:function(e){return this.x+=e.x,this.y+=e.y,this},_sub:function(e){return this.x-=e.x,this.y-=e.y,this},_mult:function(e){return this.x*=e,this.y*=e,this},_div:function(e){return this.x/=e,this.y/=e,this},_multByPoint:function(e){return this.x*=e.x,this.y*=e.y,this},_divByPoint:function(e){return this.x/=e.x,this.y/=e.y,this},_unit:function(){return this._div(this.mag()),this},_perp:function(){var e=this.y;return this.y=this.x,this.x=-e,this},_rotate:function(e){var t=Math.cos(e),i=Math.sin(e),r=t*this.x-i*this.y,n=i*this.x+t*this.y;return this.x=r,this.y=n,this},_rotateAround:function(e,t){var i=Math.cos(e),r=Math.sin(e),n=t.x+i*(this.x-t.x)-r*(this.y-t.y),s=t.y+r*(this.x-t.x)+i*(this.y-t.y);return this.x=n,this.y=s,this},_round:function(){return this.x=Math.round(this.x),this.y=Math.round(this.y),this}};H.convert=function(e){return e instanceof H?e:Array.isArray(e)?new H(e[0],e[1]):e}});var Tt=E((Ei,ee)=>{"use strict";var Ne=Q();ee.exports=G;function G(e,t,i,r,n){this.properties={},this.extent=i,this.type=0,this._pbf=e,this._geometry=-1,this._keys=r,this._values=n,e.readFields($e,this,t)}function $e(e,t,i){e==1?t.id=i.readVarint():e==2?He(i,t):e==3?t.type=i.readVarint():e==4&&(t._geometry=i.pos)}function He(e,t){for(var i=e.readVarint()+e.pos;e.pos<i;){var r=t._keys[e.readVarint()],n=t._values[e.readVarint()];t.properties[r]=n}}G.types=["Unknown","Point","LineString","Polygon"];G.prototype.loadGeometry=function(){var e=this._pbf;e.pos=this._geometry;for(var t=e.readVarint()+e.pos,i=1,r=0,n=0,s=0,a=[],o;e.pos<t;){if(r<=0){var l=e.readVarint();i=l&7,r=l>>3}if(r--,i===1||i===2)n+=e.readSVarint(),s+=e.readSVarint(),i===1&&(o&&a.push(o),o=[]),o.push(new Ne(n,s));else if(i===7)o&&o.push(o[0].clone());else throw new Error("unknown command "+i)}return o&&a.push(o),a};G.prototype.bbox=function(){var e=this._pbf;e.pos=this._geometry;for(var t=e.readVarint()+e.pos,i=1,r=0,n=0,s=0,a=Infinity,o=-Infinity,l=Infinity,u=-Infinity;e.pos<t;){if(r<=0){var c=e.readVarint();i=c&7,r=c>>3}if(r--,i===1||i===2)n+=e.readSVarint(),s+=e.readSVarint(),n<a&&(a=n),n>o&&(o=n),s<l&&(l=s),s>u&&(u=s);else if(i!==7)throw new Error("unknown command "+i)}return[a,l,o,u]};G.prototype.toGeoJSON=function(e,t,i){var r=this.extent*Math.pow(2,i),n=this.extent*e,s=this.extent*t,a=this.loadGeometry(),o=G.types[this.type],l,u;function c(v){for(var g=0;g<v.length;g++){var F=v[g],h=180-(F.y+s)*360/r;v[g]=[(F.x+n)*360/r-180,360/Math.PI*Math.atan(Math.exp(h*Math.PI/180))-90]}}switch(this.type){case 1:var x=[];for(l=0;l<a.length;l++)x[l]=a[l][0];a=x,c(a);break;case 2:for(l=0;l<a.length;l++)c(a[l]);break;case 3:for(a=Qe(a),l=0;l<a.length;l++)for(u=0;u<a[l].length;u++)c(a[l][u]);break}a.length===1?a=a[0]:o="Multi"+o;var p={type:"Feature",geometry:{type:o,coordinates:a},properties:this.properties};return"id"in this&&(p.id=this.id),p};function Qe(e){var t=e.length;if(t<=1)return[e];for(var i=[],r,n,s=0;s<t;s++){var a=Ge(e[s]);a!==0&&(n===void 0&&(n=a<0),n===a<0?(r&&i.push(r),r=[e[s]]):r.push(e[s]))}return r&&i.push(r),i}function Ge(e){for(var t=0,i=0,r=e.length,n=r-1,s,a;i<r;n=i++)s=e[i],a=e[n],t+=(a.x-s.x)*(s.y+a.y);return t}});var Bt=E((Yi,ie)=>{"use strict";var Je=Tt();ie.exports=re;function re(e,t){this.version=1,this.name=null,this.extent=4096,this.length=0,this._pbf=e,this._keys=[],this._values=[],this._features=[],e.readFields(Ke,this,t),this.length=this._features.length}function Ke(e,t,i){e===15?t.version=i.readVarint():e===1?t.name=i.readString():e===5?t.extent=i.readVarint():e===2?t._features.push(i.pos):e===3?t._keys.push(i.readString()):e===4&&t._values.push(ti(i))}function ti(e){for(var t=null,i=e.readVarint()+e.pos;e.pos<i;){var r=e.readVarint()>>3;t=r===1?e.readString():r===2?e.readFloat():r===3?e.readDouble():r===4?e.readVarint64():r===5?e.readVarint():r===6?e.readSVarint():r===7?e.readBoolean():null}return t}re.prototype.feature=function(e){if(e<0||e>=this._features.length)throw new Error("feature index out of bounds");this._pbf.pos=this._features[e];var t=this._pbf.readVarint()+this._pbf.pos;return new Je(this._pbf,t,this.extent,this._keys,this._values)}});var se=E((Ii,ne)=>{"use strict";var ei=Bt();ne.exports=ii;function 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v=p.anchor,g=p.bbox,F={minX:(t.x*a+v.x)*s+g.minX,minY:(t.y*a+v.y)*s+g.minY,maxX:(t.x*a+v.x)*s+g.maxX,maxY:(t.y*a+v.y)*s+g.maxY},h=this.tree.search(F);if(h.length==0){let f={anchor:new O.default(t.x*a+v.x,t.y*a+v.y).mult(s),draw:p.draw,order:o,key:et(t)};this.tree.insert(Object.assign(f,F));let d=a*s;(F.maxX>(t.x+1)*d||F.minX<t.x*d||F.minY<t.y*d||F.maxY>(t.y+1)*d)&&this.findSpills(n,t,F)}else{let f=!0;for(let d of h)o>=d.order&&(f=!1);if(f){for(let w of h)this.findSpills(n,t,w),this.tree.remove(w);let d={anchor:new O.default(t.x*a+v.x,t.y*a+v.y).mult(s),draw:p.draw,order:o};this.tree.insert(Object.assign(d,F))}}}}return n.size>0&&this.listener(n),!0}},At=class extends It{constructor(t,i,r,n){super(t,i,r,n);this.active=!0}get(){return C(this,null,function*(){let t=yield this.view.get();for(let i of t)this.layout(i.tile,i.data);return{data:this.tree,bbox:{minX:0,minY:0,maxX:16384,maxY:16384},transform:{scale:.25,translate:new O.default(-0,-0)}}})}findSpills(){}},Le=class extends 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Xt.default(g.maxX,g.maxY).mult(r.transform.scale).add(r.transform.translate),f=g.anchor.clone().mult(r.transform.scale).add(r.transform.translate);o.strokeRect(F.x,F.y,h.x-F.x,h.y-F.y),o.fillRect(f.x-2,f.y-2,4,4)}return performance.now()-a}var W=E(H());var ve=E(be()),Fe=class extends Error{constructor(t){super(t);this.name="AbortError"}},It=class{constructor(t,i,r,n){this.tree=new ve.default,this.view=t,this.z=i,this.scratch=r,this.labelStyle=n}layout(t,i){let r=performance.now();if(!this.active)return!1;let n=new Set,s=1<<this.z-t.z-this.view.levelDiff,a=this.view.dataResolution;for(var[o,l]of this.labelStyle.entries()){if(l.visible==!1||l.minzoom&&this.z<l.minzoom||l.maxzoom&&this.z>l.maxzoom)continue;let u=i[l.dataLayer];if(u===void 0)continue;let c=u;l.sort&&c.sort((p,x)=>l.sort(p.properties,x.properties));for(let p of c){if(l.filter&&!l.filter(p.properties))continue;let x=l.symbolizer.stash(this.scratch,p,this.z);if(!x)continue;let 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+    <g transform="translate(5,5)">
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+</svg>
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 /*! ieee754. BSD-3-Clause License. Feross Aboukhadijeh <https://feross.org/opensource> */