diff --git a/src/scripting/smjs/cache_object.c b/src/scripting/smjs/cache_object.c
index 0bdb5635..8b69ae99 100644
--- a/src/scripting/smjs/cache_object.c
+++ b/src/scripting/smjs/cache_object.c
@@ -72,7 +72,10 @@ cache_entry_get_property(JSContext *ctx, JSObject *obj, jsid id, jsval *vp)
 	case CACHE_ENTRY_CONTENT: {
 		struct fragment *fragment = get_cache_fragment(cached);
 
-		assert(fragment);
+		if (!fragment) {
+			ret = JS_FALSE;
+			break;
+		}
 
 		*vp = STRING_TO_JSVAL(JS_NewStringCopyN(smjs_ctx,
 	                                                fragment->data,