diff --git a/administrator/components/com_menus/models/fields/modal/menu.php b/administrator/components/com_menus/models/fields/modal/menu.php
index bd0da938795cc..0be6d92d3ed83 100644
--- a/administrator/components/com_menus/models/fields/modal/menu.php
+++ b/administrator/components/com_menus/models/fields/modal/menu.php
@@ -98,6 +98,7 @@ public function __set($name, $value)
 			case 'allowClear':
 			case 'allowNew':
 			case 'allowEdit':
+				$value = (string) $value;
 				$this->$name = !($value === 'false' || $value === 'off' || $value === '0');
 				break;
 
diff --git a/libraries/legacy/form/field/componentlayout.php b/libraries/legacy/form/field/componentlayout.php
index cc68baa1f882b..70ac4a0b63c89 100644
--- a/libraries/legacy/form/field/componentlayout.php
+++ b/libraries/legacy/form/field/componentlayout.php
@@ -115,7 +115,7 @@ protected function getInput()
 			$groups = array();
 
 			// Add a Use Global option if useglobal="true" in XML file
-			if ($this->element['useglobal'] === 'true')
+			if ((string) $this->element['useglobal'] === 'true')
 			{
 				$groups[JText::_('JOPTION_FROM_STANDARD')]['items'][] = JHtml::_('select.option', '', JText::_('JGLOBAL_USE_GLOBAL'));
 			}
diff --git a/libraries/src/Form/Field/HelpsiteField.php b/libraries/src/Form/Field/HelpsiteField.php
index 4f277e9862393..3ab75ee2d7a0c 100644
--- a/libraries/src/Form/Field/HelpsiteField.php
+++ b/libraries/src/Form/Field/HelpsiteField.php
@@ -57,7 +57,7 @@ protected function getInput()
 	{
 		\JHtml::_('script', 'system/helpsite.js', array('version' => 'auto', 'relative' => true));
 
-		$showDefault = $this->getAttribute('showDefault') === 'false' ? 'false' : 'true';
+		$showDefault = (string) $this->getAttribute('showDefault') === 'false' ? 'false' : 'true';
 
 		$html = parent::getInput();
 		$button = '<button
diff --git a/libraries/src/Form/Field/LimitboxField.php b/libraries/src/Form/Field/LimitboxField.php
index 22152f31bdfe4..bb169972f5189 100644
--- a/libraries/src/Form/Field/LimitboxField.php
+++ b/libraries/src/Form/Field/LimitboxField.php
@@ -85,7 +85,7 @@ protected function getOptions()
 			asort($limits);
 
 			// Add an option to show all?
-			$showAll = isset($this->element['showall']) ? $this->element['showall'] === 'true' : true;
+			$showAll = isset($this->element['showall']) ? (string) $this->element['showall'] === 'true' : true;
 
 			if ($showAll)
 			{
diff --git a/libraries/src/Form/Field/TagField.php b/libraries/src/Form/Field/TagField.php
index 9b042ecca9853..83b251962ef4e 100644
--- a/libraries/src/Form/Field/TagField.php
+++ b/libraries/src/Form/Field/TagField.php
@@ -260,7 +260,7 @@ public function isNested()
 	 */
 	public function allowCustom()
 	{
-		if (isset($this->element['custom']) && $this->element['custom'] === 'deny')
+		if (isset($this->element['custom']) && (string) $this->element['custom'] === 'deny')
 		{
 			return false;
 		}