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Please forward to developers of this application. I can see only two group messages created via message+.

macOS Mojave Version 10.14 Beta (18A383a)

Here is the output from console:

Sep 10 01:45:08 MacBook-Pro Message+[3807]: objc[3807]: Class SSKeychain is implemented in both /System/Library/PrivateFrameworks/StoreServices.framework/Versions/A/StoreServices (0x7fffa7b71b18) and /Applications/Message+.app/Contents/MacOS/Message+ (0x1011f67c0). One of the two will be used. Which one is undefined.
Sep 10 01:45:08 MacBook-Pro com.apple.xpc.launchd[1] (com.apple.imfoundation.IMRemoteURLConnectionAgent): Unknown key for integer: _DirtyJetsamMemoryLimit
Sep 10 01:45:08 MacBook-Pro Message+[3807]: DEPRECATED USE in libdispatch client: dispatch source activated with no event handler set; set a breakpoint on _dispatch_bug_deprecated to debug
Sep 10 01:45:08 MacBook-Pro Message+[3807]: [Crashlytics] Version 3.7.3 (114)