diff --git a/CHANGELOG.md b/CHANGELOG.md
index c86739a136..b702615f21 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,9 @@
 
 ### 🐞 Bug Fixes
 * Fixed transparent background for popup inline editors.
+* Exceptions that occur in custom application tooltips will now be caught and logged to console,
+ rather than crashing grid.
+
 
 ### ⚙️ Technical
 * Improvements to exception handling during app initialization
diff --git a/cmp/grid/columns/Column.ts b/cmp/grid/columns/Column.ts
index afced6b965..396b7707ac 100644
--- a/cmp/grid/columns/Column.ts
+++ b/cmp/grid/columns/Column.ts
@@ -42,7 +42,7 @@ import {
 } from 'react';
 import {GridModel} from '../GridModel';
 import {GridSorter} from '../GridSorter';
-import {managedRenderer} from '../impl/Utils';
+import {getAgHeaderClassFn, managedRenderer} from '../impl/Utils';
 import {
     ColumnCellClassFn,
     ColumnCellClassRuleFn,
@@ -62,10 +62,8 @@ import {
 } from '../Types';
 import {ExcelFormat} from '../enums/ExcelFormat';
 import {FunctionComponent} from 'react';
-import {ColumnGroup} from './ColumnGroup';
 import type {
     ColDef,
-    HeaderClassParams,
     ITooltipParams,
     ValueGetterParams,
     ValueSetterParams
@@ -817,9 +815,15 @@ export class Column {
                             store
                         });
 
-                    ret = isFunction(tooltip)
-                        ? tooltip(val, {record, column: this, gridModel, agParams})
-                        : val;
+                    if (isFunction(tooltip)) {
+                        try {
+                            ret = tooltip(val, {record, gridModel, agParams, column: this});
+                        } catch (e) {
+                            logWarn([`Failure in tooltip for '${this.displayName}'`, e], 'Column');
+                        }
+                    } else {
+                        ret = val;
+                    }
                 }
 
                 const isElement = isValidElement(ret);
@@ -1083,34 +1087,3 @@ export class Column {
             : record?.data[sortValue] ?? v;
     }
 }
-
-export function getAgHeaderClassFn(
-    column: Column | ColumnGroup
-): (params: HeaderClassParams) => string[] {
-    // Generate CSS classes for headers.
-    // Default alignment classes are mixed in with any provided custom classes.
-    const {headerClass, headerAlign, gridModel} = column;
-
-    return agParams => {
-        let r = [];
-        if (headerClass) {
-            r = castArray(
-                isFunction(headerClass) ? headerClass({column, gridModel, agParams}) : headerClass
-            );
-        }
-
-        if (headerAlign === 'center' || headerAlign === 'right') {
-            r.push('xh-column-header-align-' + headerAlign);
-        }
-
-        if (column instanceof Column && column.isTreeColumn && column.headerHasExpandCollapse) {
-            r.push('xh-column-header--with-expand-collapse');
-        }
-
-        if (gridModel.headerMenuDisplay === 'hover') {
-            r.push('xh-column-header--hoverable');
-        }
-
-        return r;
-    };
-}
diff --git a/cmp/grid/columns/ColumnGroup.ts b/cmp/grid/columns/ColumnGroup.ts
index fa34c57e40..895f04bffd 100644
--- a/cmp/grid/columns/ColumnGroup.ts
+++ b/cmp/grid/columns/ColumnGroup.ts
@@ -4,6 +4,7 @@
  *
  * Copyright © 2023 Extremely Heavy Industries Inc.
  */
+import {getAgHeaderClassFn} from '@xh/hoist/cmp/grid/impl/Utils';
 import {HAlign, PlainObject, Some, Thunkable, XH} from '@xh/hoist/core';
 import {genDisplayName} from '@xh/hoist/data';
 
@@ -13,7 +14,7 @@ import {clone, isEmpty, isFunction, isString, keysIn} from 'lodash';
 import {ReactNode} from 'react';
 import {GridModel} from '../GridModel';
 import {ColumnHeaderClassFn, ColumnHeaderNameFn} from '../Types';
-import {Column, ColumnSpec, getAgHeaderClassFn} from './Column';
+import {Column, ColumnSpec} from './Column';
 
 export interface ColumnGroupSpec {
     /** Column or ColumnGroup configs for children of this group.*/
diff --git a/cmp/grid/impl/Utils.ts b/cmp/grid/impl/Utils.ts
index f8396a3d75..48b178a545 100644
--- a/cmp/grid/impl/Utils.ts
+++ b/cmp/grid/impl/Utils.ts
@@ -4,12 +4,11 @@
  *
  * Copyright © 2023 Extremely Heavy Industries Inc.
  */
-import {ColumnRenderer, GroupRowRenderer} from '@xh/hoist/cmp/grid';
-import {isFunction} from 'lodash';
+import {Column, ColumnGroup, ColumnRenderer, GroupRowRenderer} from '@xh/hoist/cmp/grid';
+import {HeaderClassParams} from '@xh/hoist/kit/ag-grid';
+import {castArray, isFunction} from 'lodash';
 
-/**
- * @internal
- */
+/** @internal */
 export function managedRenderer<T extends ColumnRenderer | GroupRowRenderer>(
     fn: T,
     identifier: string
@@ -24,3 +23,38 @@ export function managedRenderer<T extends ColumnRenderer | GroupRowRenderer>(
         }
     } as unknown as T;
 }
+
+/**
+ *   Generate CSS classes for headers.
+ *   Default alignment classes are mixed in with any provided custom classes.
+ *
+ *   @internal
+ */
+export function getAgHeaderClassFn(
+    column: Column | ColumnGroup
+): (params: HeaderClassParams) => string[] {
+    const {headerClass, headerAlign, gridModel} = column;
+
+    return agParams => {
+        let r = [];
+        if (headerClass) {
+            r = castArray(
+                isFunction(headerClass) ? headerClass({column, gridModel, agParams}) : headerClass
+            );
+        }
+
+        if (headerAlign === 'center' || headerAlign === 'right') {
+            r.push('xh-column-header-align-' + headerAlign);
+        }
+
+        if (column instanceof Column && column.isTreeColumn && column.headerHasExpandCollapse) {
+            r.push('xh-column-header--with-expand-collapse');
+        }
+
+        if (gridModel.headerMenuDisplay === 'hover') {
+            r.push('xh-column-header--hoverable');
+        }
+
+        return r;
+    };
+}