--- img_assist.module.orig	2008-01-31 14:14:38.000000000 +0200
+++ img_assist.module	2008-01-31 14:14:49.000000000 +0200
@@ -1408,8 +1408,10 @@
       foreach ($type['fields'] as $field) {
         // Distinguish between plain text fields and filtered fields:
         if (!empty($field['text_processing'])) {
-          foreach ($node->{$field['field_name']} as $field_instance) {
-            $content .= $field_instance['value'];
+          if (count($node->{$field['field_name']})) {
+            foreach ($node->{$field['field_name']} as $field_instance) {
+              $content .= $field_instance['value'];
+            }
           }
         }
       }