D25254.1741813748.diff
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	diff --git a/src/applications/multimeter/controller/MultimeterSampleController.php b/src/applications/multimeter/controller/MultimeterSampleController.php
	--- a/src/applications/multimeter/controller/MultimeterSampleController.php
	+++ b/src/applications/multimeter/controller/MultimeterSampleController.php
	@@ -10,7 +10,7 @@
	$viewer = $this->getViewer();
	$group_map = $this->getColumnMap();

	- $group = explode('.', $request->getStr('group'));
	+ $group = explode('.', $request->getStr('group', ''));
	$group = array_intersect($group, array_keys($group_map));
	$group = array_fuse($group);