diff -r 5c708d546d02dedc94265a9b4661e1889b459544 -r 791947e132cd5586593ba7dab5bb0654f5fac50d indefero/src/IDF/Form/Admin/ProjectDelete.php
--- a/indefero/src/IDF/Form/Admin/ProjectDelete.php	Sun Aug 11 15:05:46 2013 -0500
+++ b/indefero/src/IDF/Form/Admin/ProjectDelete.php	Sun Aug 11 17:15:05 2013 -0500
@@ -80,6 +80,10 @@
         // So, we drop the project, it will cascade and delete all the
         // elements of the project. For large projects, this may use
         // quite some memory.
+
+        // This is to fix a FK constraint
+        $this->project->current_activity = null;
+        $this->project->update();
         $this->project->delete();
         return true;
     }