Werk #19100: Proxmox VE special agent: Fix json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

Component

Checks & agents

Title

Proxmox VE special agent: Fix json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

Date

Jan 4, 2026

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.5.0b1 Not yet released	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.4.0p20	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

The JSON cache file handling for files located at '~/tmp/check_mk/json_cache/' was fixed to prevent the error:

json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

Previously, if the cache file was missing, this error could occur, potentially causing the special agent to fail. With this fix, the system now handles missing cache files gracefully and recovers automatically without requiring any user intervention.

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