Testing with WP 4.3

I have been testing after updating to WP 4.3 and receive a fatal error.

This is the log:

[0.0013] Info: WP_Query results written to log
[0.0000] Registered sizes: ["thumbnail","medium","large","full"]
[0.0001] Meta indexed so far: 1 / 28
[0.0007] Sample meta:
{"width":450,"height":450,"file":"2015\/09\/Ditchling-AC-Logo-450px.jpg","sizes":{"thumbnail":{"file":"Ditchling-AC-Logo-450px-150x150.jpg","width":150,"height":150,"mime-type":"image\/jpeg"}},"image_meta":{"aperture":0,"credit":"","camera":"","caption":"","created_timestamp":0,"copyright":"","focal_length":0,"iso":0,"shutter_speed":0,"title":"","orientation":0}}
[0.0185] Meta indexed so far: 28 / 28
[0.0212] Info: Valid and Invalid meta results written to log
[0.0009] Info: Loaded attachments to memory [40 mb]
[0.0060] Info: 76 Images found [40 mb]
[0.0080] Info: 0 Invalid images found [40 mb]
[0.0100] Info: Retrieved attachment images from DB [40 mb]
[0.0156] Info: Backup meta results written to log [40 mb]
[0.0002] Posts checked for used images 1/17
[0.0007] Info: Invalid post image meta results written to log
Warning: skipping script index because of too many image files
[0.0004] Warning: skipping attachment index because of too many image files
[0.0068] Info: Unreferenced image file results written to log
[0.0001] Uknown error: Please see returned value below

<br />
<b>Notice</b>:  Array to string conversion in <b>/home/ditchlin/public_html/test/wp-content/plugins/wp-changes-tracker/wp-changes-tracker.php</b> on line <b>125</b><br />
<br />
<b>Notice</b>:  Array to string conversion in <b>/home/ditchlin/public_html/test/wp-content/plugins/wp-changes-tracker/wp-changes-tracker.php</b> on line <b>125</b><br />
1

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