Fix New hover on error code throws exception

[koxudaxi]

Closes: #213

[github-actions]

Qodana Community for JVM

14 new problems were found

Inspection name	Severity	Problems
Unstable API Usage	🔶 Warning	6
Incorrect string capitalization	🔶 Warning	2
Unused import directive	🔶 Warning	1
Unused symbol	🔶 Warning	1
Class member can have 'private' visibility	◽️ Notice	2
Regular expression can be simplified	◽️ Notice	1
Array property in data class	◽️ Notice	1

💡 Qodana analysis was run in the pull request mode: only the changed files were checked

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