[BUGFIX] Fix broken flexform configuration field

Classes/Hooks/PageLayoutView/PluginRenderer.php

@@ -59,23 +59,25 @@ class PluginRenderer implements PageLayoutViewDrawItemHookInterface {
 			// Set plugin options array
 			$pluginOptions = GeneralUtility::xml2array($row['pi_flexform'], 'T3:');
 			$templateOptions = [];
-			foreach ($pluginOptions['data']['sDEF']['lDEF'] as $option => $value) {
-				if ($option !== 'settings.showApiResult') {
-					// $option has the format 'settings.<key>', but in the template we want the language label which
-					// has the format 'flexform.<key>'.
-					$templateOptions[str_replace('settings.', '', $option)] = $value['vDEF'];
+			if (is_array($pluginOptions)) {
+				foreach ($pluginOptions['data']['sDEF']['lDEF'] as $option => $value) {
+					if ($option !== 'settings.showApiResult') {
+						// $option has the format 'settings.<key>', but in the template we want the language label which
+						// has the format 'flexform.<key>'.
+						$templateOptions[str_replace('settings.', '', $option)] = $value['vDEF'];
+					}
 				}
-			}
 
-			$languageService = GeneralUtility::makeInstance(LanguageService::class);
-			$templateOptions['flexform.thumbnailType'] = $languageService->sL(
-				'LLL:EXT:sg_youtube/Resources/Private/Language/locallang.xlf:flexform.thumbnailType.' . $templateOptions['flexform.thumbnailType']
-			);
+				$languageService = GeneralUtility::makeInstance(LanguageService::class);
+				$templateOptions['flexform.thumbnailType'] = $languageService->sL(
+					'LLL:EXT:sg_youtube/Resources/Private/Language/locallang.xlf:flexform.thumbnailType.' . $templateOptions['flexform.thumbnailType']
+				);
 
-			$view->assignMultiple([
-				'pluginOptions' => $templateOptions,
-				'showApiResult' => $pluginOptions['data']['sDEF']['lDEF']['settings.showApiResult']['vDEF']
-			]);
+				$view->assignMultiple([
+					'pluginOptions' => $templateOptions,
+					'showApiResult' => $pluginOptions['data']['sDEF']['lDEF']['settings.showApiResult']['vDEF']
+				]);
+			}
 
 			// Content element labels
 			$pluginName = BackendUtility::getLabelFromItemListMerged(

Configuration/FlexForms/flexform_sgyoutube_youtube.xml

@@ -58,6 +58,7 @@
 							<label>LLL:EXT:sg_youtube/Resources/Private/Language/locallang.xlf:flexform.aspectRatio</label>
 							<config>
 								<type>select</type>
+								<renderType>selectSingle</renderType>
 								<items type="array">
 									<numIndex index="0" type="array">
 										<numIndex index="0">16:9</numIndex>
@@ -76,6 +77,7 @@
 							<label>LLL:EXT:sg_youtube/Resources/Private/Language/locallang.xlf:flexform.thumbnailType</label>
 							<config>
 								<type>select</type>
+								<renderType>selectSingle</renderType>
 								<items type="array">
 									<numIndex index="0" type="array">
 										<numIndex index="0">LLL:EXT:sg_youtube/Resources/Private/Language/locallang.xlf:flexform.thumbnailType.byAspectRatio</numIndex>