From a1772c00058d03ee1e4a6e3ba8f96ba2197e3f2b Mon Sep 17 00:00:00 2001
From: Dimitris - Rafail Katsampas <katsampasdr@gmail.com>
Date: Tue, 8 Mar 2022 17:36:58 +0200
Subject: [PATCH] feat: proper handling for bindings with converters that were
 undefined (#9813)

---
 .../core/ui/core/bindable/bindable-expressions.ts    | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/packages/core/ui/core/bindable/bindable-expressions.ts b/packages/core/ui/core/bindable/bindable-expressions.ts
index 1861e079f..6954030e9 100644
--- a/packages/core/ui/core/bindable/bindable-expressions.ts
+++ b/packages/core/ui/core/bindable/bindable-expressions.ts
@@ -91,7 +91,17 @@ const expressionParsers = {
 
 		if (expression.operator == '|') {
 			if (converterExpression.nsRequiresConverter) {
-				return expression.right.nsIsCallable ? right : right?.(left);
+				if (expression.right.nsIsCallable) {
+					return right;
+				}
+
+				if (isFunction(right)) {
+					return right(left);
+				}
+
+				if (isNullOrUndefined(right)) {
+					throw new Error('Cannot perform a call using a null or undefined property');
+				}
 			}
 			throw new Error('Invalid converter syntax');
 		}