diff --git a/addons/addon-webgl/src/customGlyphs/CustomGlyphRasterizer.ts b/addons/addon-webgl/src/customGlyphs/CustomGlyphRasterizer.ts
index 9d32ac3e6..eb73117e5 100644
--- a/addons/addon-webgl/src/customGlyphs/CustomGlyphRasterizer.ts
+++ b/addons/addon-webgl/src/customGlyphs/CustomGlyphRasterizer.ts
@@ -28,6 +28,10 @@ export function loadCustomGlyphDefinitions(): Promise<void> {
   if (!loadingPromise) {
     loadingPromise = import('./CustomGlyphDefinitions').then(module => {
       customGlyphDefinitions = module.customGlyphDefinitions;
+    }).catch(err => {
+      // Reset the loading promise on failure to allow retry
+      loadingPromise = undefined;
+      throw err;
     });
   }
   return loadingPromise;