Fix cursor leak during an error

Author: sharadraju

doc/src/release_notes.rst

@@ -21,6 +21,9 @@ node-oracledb `v6.0.1 <https://github.com/oracle/node-oracledb/compare/v6.0.0...
 #)  Added clear error message when an attempt is made to establish a connection
     with an unsupported database version in Thin mode.
 
+#)  Fixed bug which caused a cursor leak if an error was thrown while
+    processing the execution of a query.
+
 #)  The buffer and process modules are now imported consistently instead of
     relying on global variable definitions, as suggested by Sławomir Osoba in
     `GitHub pull request #1559

lib/thin/protocol/messages/withData.js

@@ -96,7 +96,9 @@ class MessageWithData extends Message {
 
   processErrorInfo(buf) {
     super.processErrorInfo(buf);
-    this.statement.cursorId = this.errorInfo.cursorId;
+    if (this.errorInfo.cursorId !== 0) {
+      this.statement.cursorId = this.errorInfo.cursorId;
+    }
     if (!this.statement.isPlSql) {
       this.statement.rowCount = this.errorInfo.rowCount;
     }