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Merge pull request #611 from linguica/master

doom: Add error message to 1-sided DR special crash

--- a/src/doom/p_doors.c

+++ b/src/doom/p_doors.c

@@ -392,6 +392,12 @@

     }

     // if the sector has an active thinker, use it

+

+    if (line->sidenum[side^1] == -1)

+    {

+        I_Error("EV_VerticalDoor: DR special type on 1-sided linedef");

+    }

+

     sec = sides[ line->sidenum[side^1]] .sector;

     if (sec->specialdata)