diff --git a/HISTORY b/HISTORY
index 11c75fc0..d4c95ce2 100644
--- a/HISTORY
+++ b/HISTORY
@@ -8925,7 +8925,7 @@ Video Disk Recorder Revision History
 - Now stopping any ongoing recordings before stopping the plugins, to avoid
   a crash when stopping VDR while recording.
 
-2017-04-22: Version 2.3.4
+2017-04-24: Version 2.3.4
 
 - The functionality of HandleRemoteModifications(), which synchronizes changes to
   timers between peer VDR machines, has been moved to timers.[ch] and renamed to
@@ -8989,3 +8989,4 @@ Video Disk Recorder Revision History
   ':ids' is given (suggested by Dietmar Spingler).
 - If 0 is given as the channel number in the SVDRP command LSTC, the data of the
   current channel is listed.
+- Fixed a possible crash when pulling the CAM while decrypting a channel with MTD.
diff --git a/ci.c b/ci.c
index d3244e54..ee338279 100644
--- a/ci.c
+++ b/ci.c
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: ci.c 4.11 2017/04/11 16:45:55 kls Exp $
+ * $Id: ci.c 4.12 2017/04/24 09:05:49 kls Exp $
  */
 
 #include "ci.h"
@@ -1968,9 +1968,10 @@ void cCamSlot::Process(cTPDU *TPDU)
           case msNone:
                dbgprotocol("Slot %d: no module present\n", slotNumber);
                isyslog("CAM %d: no module present", slotNumber);
-               MtdActivate(false);
+               StopDecrypting();
                DeleteAllConnections();
                CancelActivation();
+               MtdActivate(false);
                break;
           case msReset:
                dbgprotocol("Slot %d: module reset\n", slotNumber);