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How to resolve Katalon Studio crashing frequently?

Condition​

Users have reported that Katalon Studio crashes randomly when using version 9.x, with crashes becoming more frequent after upgrading to KS 10.3.0, even after applying the Combined Hover workaround.

  • Having multiple split tabs open increases the chance of a crash.
  • Running tests while multiple Katalon windows are open often leads to a crash.
  • Running tests in a single window typically does not cause crashes.

Cause​

This issue is linked to an underlying problem in the Eclipse framework, as reported in the Eclipse community: Crash in Embedded WebKit on macOS 15.4 (ARM64) with Eclipse 4.35.0.

  • Affected Eclipse versions: 4.32 through 4.35, impacting Katalon Studio 10.3.2 (Eclipse 4.33)
  • Crash condition: macOS 15.4 (ARM64) with Embedded WebKit rendering engine
  • Earlier Eclipse versions may also be affected, but this has not been officially confirmed

Since the crash stems from macOS or Eclipse, Katalon Studio cannot guarantee a permanent fix until Apple or Eclipse releases a patch.

Solution​

While waiting for a permanent fix, you can try the following workarounds:

Option 1: Downgrade Katalon Studio​

  • Use an older Katalon Studio version that runs on Eclipse earlier than 4.32 (e.g., KS 9.5.0 or older)
  • This avoids the affected Eclipse versions where the WebKit crash occurs
  • If the issue persists, try an even older version of Katalon

Option 2: Downgrade macOS​

  • If possible, downgrade macOS to 15.3 or below, where the crash has not been observed. For instructions, refer to this Apple official guide: How to download and install macOS

Option 3: Minimize concurrent usage​

  • Avoid opening multiple Katalon windows simultaneously
  • Limit the number of split tabs to reduce UI rendering load
  • These steps can help reduce crash frequency until an official fix is available
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