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If the problem still occurs after installing Java 11 (jdk-11.0.4), make sure SQL Developer is actually using it. That is, you control which jdk SQL Developer uses by editing the SetJavaHome line in the sqldeveloper\19.2.0\product.conf file.
If changing SetJavaHome to use jdk-11.0.4 still does not work, or if you just leave it set to a Java 8 jdk (like the current latest, jdk1.8.0_221), as an alternate workaround you can try disabling the Welcome Page display (uncheck Show on startup at page bottom) as suggested in an earlier discussion:
Thank you very much!
SQL Developer is actually using Java 11 (jdk-11.0.4), but no effect.
Finally I resloved when (uncheck Show on startup at page bottom).
SQL Developer 126.96.36.199 Build 206.2117