Invalid GlideRecord operation: cannot update without valid sys_id

Calling update() on a GlideRecord that was instantiated with new GlideRecord() but never queried to retrieve an existing record (high likelihood)

Attempting to use update() instead of insert() when creating a new record (high likelihood)

Calling update() or delete() on a GlideRecord after the sys_id field was cleared or set to an invalid value (medium likelihood)

Using update() on a GlideRecord that failed to retrieve any records from a query (empty result set) (medium likelihood)

Calling update() on a GlideRecord where the sys_id was manually set to null, undefined, or empty string (low likelihood)

Step 1: Check the System Application Log at System Diagnostics > Log > Application Log to identify the exact script and line number where the error occurred

Step 2: Locate the problematic GlideRecord code and verify if you intended to update an existing record or create a new one

Step 3: If creating a new record, replace gr.update() with gr.insert() and ensure all required fields are populated before the insert operation

Step 4: If updating an existing record, ensure the GlideRecord is properly queried using get(), query() and next(), or getDisplayValue() before calling update()

Step 5: Add a validation check using gr.isValidRecord() or gr.getValue('sys_id') to verify the record has a valid sys_id before calling update() or delete()

Step 6: Test the corrected script in a development instance using the Scripts - Background module or Script Debugger to verify the fix

Step 7: Review related code for similar patterns that might cause the same error in other locations