Note: Occurs when "Toggle spell check" option is enabled. Disabling the option, no crash.
Same problem with 27af15f9 with reverts to allow use with Geany 1.38 (5e130960bc6b9f3b3158cdb35d27f6bba03ba3c5 and 01b19d2d401f49f220157f28cc5e53de491f71a9). Unable to build for Geany git/1.39 because Lua appears to require another Scintilla update.
Language doesn't seem to matter. I tried en_AU, en_GB, en_US. Font setting for editor and symbol list don't seem to matter. Tried Hack, Noto Sans, Courier Prime.
Installed emoji font is noto-fonts-emoji 20220920.