diff --git a/processui/ProcessModel.cpp b/processui/ProcessModel.cpp
--- a/processui/ProcessModel.cpp
+++ b/processui/ProcessModel.cpp
@@ -577,7 +577,7 @@
             return;
 
         w = new WindowInfo(wid, pid);
-        mPidToWindowInfo.insertMulti(pid, w);
+        mPidToWindowInfo.insert(pid, w);
         mWIdToWindowInfo.insert(wid, w);
     }