diff --git a/tools/generate-block-palette-spec.php b/tools/generate-block-palette-spec.php
index a9992ec1aa..c3b04b0e52 100644
--- a/tools/generate-block-palette-spec.php
+++ b/tools/generate-block-palette-spec.php
@@ -77,6 +77,7 @@ $reportMap = [];
 foreach($palette->getStates() as $entry){
 	$state = $entry->getStateData();
 	$name = $state->getName();
+	$reportMap[$name] ??= [];
 	foreach($state->getStates() as $propertyName => $value){
 		if($value instanceof IntTag || $value instanceof StringTag){
 			$rawValue = $value->getValue();