Error when applying Crystal theme

[sander]

When I install the Crystal directory from the download on sourceforge to the source distribution of Coccinella, and references are saved in the same directory as the pogram, there is an error.

When hitting the Save button:

Hook themeChangedHook failed: 1
key "chat" not known in dictionary
    while executing
"dict get $prevImagesD $type $pres"
    (procedure "GarbageCollect" line 7)
    invoked from within
"GarbageCollect $prevImagesD $imagesD"
    (procedure "::Rosticons::ThemeChangedHook" line 22)
    invoked from within
"::Rosticons::ThemeChangedHook"
    ("eval" body line 1)
    invoked from within
"eval $func $args"
key "chat" not known in dictionary
    while executing
"dict get $prevImagesD $type $pres"
    (procedure "GarbageCollect" line 7)
    invoked from within
"GarbageCollect $prevImagesD $imagesD"
    (procedure "::Rosticons::ThemeChangedHook" line 22)
    invoked from within
"::Rosticons::ThemeChangedHook"
    ("eval" body line 1)
    invoked from within
"eval $func $args"