Six engine errors popped up while ordering town alert mode in a "safe room"

[OlderThanBefore]

Summary:
Six engine errors popped up while ordering town alert mode in a “safe room”
Steps to reproduce:

1. Build this “safe room” :
   
2. Put the blue Flag in the center of the “safe room” (i’m sorry, i moved a the flag a little too the right, he was in the center when these bug popped up but didn’t get a screen from the center when all the citizen was on the flags ) :
   
3. Order “Town Alert Mode”
4. Fight back invaders with footmen at this location :
   
   :
5. Unorder “Town Alert Mode”
6. 6 engines Errors pop up at this moment

Expected Results:
Every citizen get out of the location at the unorders.
Actual Results:
One of my weaver get stuck (At this moment, the flag was on him, on the center !)

Notes:
It was random stupid weather stucked in a flag or something !

Attachments:
Here is the 6 screen of the errors
1:

2 :

3 :

4 :

5 :

6 :

Version Number and Mods in use:
develop-2786 (x64)
System Information:
dxdiag : DxDiag.txt (28.7 KB)