diff --git a/elmergrid/src/egconvert.c b/elmergrid/src/egconvert.c
index 142624265c..90a93bea5f 100644
--- a/elmergrid/src/egconvert.c
+++ b/elmergrid/src/egconvert.c
@@ -4969,8 +4969,10 @@ static int LoadGmshInput41(struct FemType *data,struct BoundaryType *bound,
 	printf("Physical tag offset for %dD is %d\n",tagdim,phystagoffset[tagdim]);
       }
 
-      tagoffset[meshdim] = maxphystag[meshdim];
-      tagoffset[meshdim-1] = phystagoffset[0];
+      if(meshdim>0) {
+        tagoffset[meshdim] = maxphystag[meshdim];
+        tagoffset[meshdim-1] = phystagoffset[0];
+      }
       for(tagdim=meshdim-2;tagdim>=0;tagdim--) {
 	tagoffset[tagdim] = tagoffset[tagdim+1]+MAX(0,maxtag[tagdim+1]);
 	printf("Geometric tag offset for %dD is %d\n",tagdim,tagoffset[tagdim]);