Icecat 7.0.1 shuts down unexpected very often

[user1]

and icecat shut down again once more just after another shutdown:

$ icecat
Could not check applicable rules for https://encrypted.google.com/webhp?
hl=en
###!!! ABORT: X_ShmPutImage: BadMatch (invalid parameter attributes); 261 
requests ago: file /build/buildd/icecat-7.0.1/toolkit/xre/
nsX11ErrorHandler.cpp, line 199
###!!! ABORT: X_ShmPutImage: BadMatch (invalid parameter attributes); 261 
requests ago: file /build/buildd/icecat-7.0.1/toolkit/xre/
nsX11ErrorHandler.cpp, line 199
Aborted