Post any defects you find in the released or beta versions of the ImageMagick software here. Include the ImageMagick version, OS, and any command-line required to reproduce the problem. Got a patch for a bug? Post it here.
The error message tells us that a proper ExceptionInfo structure is not being passed to the error handler or that IMagick is not compiled against the version of ImageMagick you have installed. If the versions do not match the ExceptionInfo structure in IMagick may not match what is required by the ImageMagick library.
RemoveNodeByValueFromSplayTree() is being passed a NULL pointer. We need a stack trace to determine where/why its being called with a NULL pointer and whether the problem is within IMagick or ImageMagick.
Not enough information to track the problem. From your stack trace the problem seems to be in imagick. We can only fix problems that trace to the ImageMagick library.
Thanks for the stack trace. We will put a check to make sure we have a valid splay-tree before we remove a node. The patch will be in ImageMagick 6.2.9-6 within a day or two.