Never ending loop when a connector is selected

[marcellobarile]

Describe the Bug

Given a specific blueprint and a specific element from the diagram, when selected, the web-modeler crashes, showing what looks like a never-ending loop.

Steps to Reproduce

1. Download the AI Email Support Agent blueprint from the web-modeler
2. Open the main diagram
3. Select the element with the name Fetch past conversations from customer(connector id io.camunda.connectors.EmbeddingsVectorDB.v1)
4. See the error:

index.esm.js:5677 Uncaught (in promise) RangeError: Maximum call stack size exceeded
    at findUnresolvedVariables (feelUtility.js:256:11)
    at Array.flatMap (<anonymous>)
    at findUnresolvedVariables (feelUtility.js:256:34)
    at getExpressionDetails (feelUtility.js:186:22)
    at eval (feelUtility.js:30:33)
    at Array.forEach (<anonymous>)
    at eval (feelUtility.js:29:21)
    at Array.forEach (<anonymous>)
    at parseVariables (feelUtility.js:28:13)
    at _resolveVariables (VariableResolver.js:82:93)

Expected Behavior

There is no loop when this element is selected

Environment

• Library version: 1.3.3

[barmac]

I can reproduce it with multiple Desktop Modeler versions: 5.37, 5.36, and even 5.28

[abdul99ahad]

It was due to the behavior of our parser in variable-resolver. Special characters in the system prompt in Handle customer request task trigger cyclic references in the parse tree, which leads to an infinite loop.

I have tried the prompt without special characters and it works.

prompt.txt