diff --git a/lib/galaxy/workflow/modules.py b/lib/galaxy/workflow/modules.py
index 1083011f898..3ecbc30fa57 100644
--- a/lib/galaxy/workflow/modules.py
+++ b/lib/galaxy/workflow/modules.py
@@ -566,8 +566,8 @@ class ToolModule( WorkflowModule ):
         self.tool_id = tool_id
         self.tool_version = tool_version
         self.tool = trans.app.toolbox.get_tool( tool_id, tool_version=tool_version, exact=exact_tools )
-        if tool_version and exact_tools and str(tool.version) != str(tool_version):
-            log.debug("Exact tool specified during workflow module creation for [%s] but couldn't find correct version [%s]" % (tool_id, tool_version))
+        if self.tool and tool_version and exact_tools and str( self.tool.version ) != str( tool_version ):
+            log.debug( "Exact tool specified during workflow module creation for [%s] but couldn't find correct version [%s]." % (tool_id, tool_version) )
             self.tool = None
         self.post_job_actions = {}
         self.runtime_post_job_actions = {}