workaround issue on postgres

this is probably a pre-existing hole in the logic,
not related really related to my work

Author: gavinking

hibernate-core/src/main/java/org/hibernate/type/descriptor/jdbc/ArrayJdbcType.java

@@ -96,7 +96,9 @@ public <T> JdbcLiteralFormatter<T> getJdbcLiteralFormatter(JavaType<T> javaTypeD
 		}
 		else {
 			//noinspection unchecked
-			elementJavaType = ( (BasicPluralJavaType<T>) javaTypeDescriptor ).getElementJavaType();
+			elementJavaType = javaTypeDescriptor instanceof BasicPluralJavaType
+					? ( (BasicPluralJavaType<T>) javaTypeDescriptor ).getElementJavaType()
+					: null; //TODO: what should really happen here?
 		}
 		final JdbcLiteralFormatter<T> elementFormatter = elementJdbcType.getJdbcLiteralFormatter( elementJavaType );
 		return new JdbcLiteralFormatterArray<>( javaTypeDescriptor, elementFormatter );