diff --git a/modules/plugin/base/src/nsPluginHostImpl.cpp b/modules/plugin/base/src/nsPluginHostImpl.cpp
index 73678dc6f0d3..f9a06cdcc08d 100644
--- a/modules/plugin/base/src/nsPluginHostImpl.cpp
+++ b/modules/plugin/base/src/nsPluginHostImpl.cpp
@@ -4364,6 +4364,10 @@ nsresult nsPluginHostImpl::ScanPluginsDirectory(nsPluginsDir& pluginsDir,
       if(NS_FAILED(res))
         continue;
 
+      // if we don't have mime type -- don't proceed, this is not a plugin
+      if(!info.fMimeTypeArray)
+        continue;
+
       nsPluginTag* pluginTag = new nsPluginTag(&info);
       pluginFile.FreePluginInfo(info);