diff --git a/TextformatterSrcset.module b/TextformatterSrcset.module
index fd5a178..fcad08c 100644
--- a/TextformatterSrcset.module
+++ b/TextformatterSrcset.module
@@ -129,7 +129,7 @@ class TextformatterSrcset extends Textformatter implements ConfigurableModule {
 				
 				//Thanks to Horst Nogajski for the following snippet
 				foreach($p->fields as $field) {
-				    if (! (bool) ($field->type instanceof FieldtypeImage)) continue; // if no images field, go on
+				    if (! (bool) ($field->type instanceof FieldtypeImage)  || is_null($p->get($field->name))) continue; // if no images field or null, go on
 				    
 				    // find the field that holds the image
 				    if (!$p->get($field->name)->has('name=' . $meta['imageName'] . '.' . $meta['ext'])) continue;
@@ -339,4 +339,4 @@ class TextformatterSrcset extends Textformatter implements ConfigurableModule {
 
         return $wrapper;
     }
-}
\ No newline at end of file
+}