fixed a bug introduced in 09a9c70811 this is the right fix now...I think

(cherry picked from commit 598c507c66)

src/server/config/spells/spellTemplate.js

@@ -64,7 +64,7 @@ module.exports = {
 	updateBase: function () {
 		if (this.castTime > 0) {
 			let action = this.currentAction;
-			if (_.getDeepProperty(action, 'target.destroyed') || (action && !this.canCast(action.target))) {
+			if (action && (_.getDeepProperty(action, 'target.destroyed') || !this.canCast(action.target))) {
 				this.currentAction = null;
 				this.castTime = 0;
 				this.obj.syncer.set(false, null, 'casting', 0);