diff --git a/src/components/Card/Card.js b/src/components/Card/Card.js
index 9991bdd..4086e89 100644
--- a/src/components/Card/Card.js
+++ b/src/components/Card/Card.js
@@ -106,8 +106,9 @@ class Card extends React.Component<Props, State> {
     const siblings = React.Children.map(
       children,
       child =>
-        /* $FlowFixMe */
-        typeof child === 'object' && child.type ? child.type.displayName : null
+        React.isValidElement(child) && child.type
+          ? child.type.displayName
+          : null
     );
     return (
       <AnimatedPaper
@@ -124,9 +125,8 @@ class Card extends React.Component<Props, State> {
             {React.Children.map(
               children,
               (child, index) =>
-                typeof child === 'object' && child !== null
-                  ? /* $FlowFixMe */
-                    React.cloneElement(child, {
+                React.isValidElement(child)
+                  ? React.cloneElement(child, {
                       index,
                       total,
                       siblings,
diff --git a/src/components/Card/CardActions.js b/src/components/Card/CardActions.js
index 97ed00c..6f79bab 100644
--- a/src/components/Card/CardActions.js
+++ b/src/components/Card/CardActions.js
@@ -36,10 +36,8 @@ class CardActions extends React.Component<Props> {
         {React.Children.map(
           this.props.children,
           child =>
-            typeof child === 'object' && child !== null
-              ? /* $FlowFixMe */
-                React.cloneElement(child, {
-                  /* $FlowFixMe */
+            React.isValidElement(child)
+              ? React.cloneElement(child, {
                   compact: child.props.compact !== false,
                 })
               : child
diff --git a/src/components/Dialog/Dialog.js b/src/components/Dialog/Dialog.js
index 61babc6..c15a929 100644
--- a/src/components/Dialog/Dialog.js
+++ b/src/components/Dialog/Dialog.js
@@ -101,24 +101,28 @@ class Dialog extends React.Component<Props, void> {
     const backgroundColor = theme.colors.paper;
 
     const childrenArray = React.Children.toArray(children);
-    /* $FlowFixMe */
-    const title = childrenArray.find(child => child.type === DialogTitle);
+    const title = childrenArray.find(
+      child => React.isValidElement(child) && child.type === DialogTitle
+    );
     const actionBtnsChildren = childrenArray.filter(
-      /* $FlowFixMe */
-      child => child && child.type === DialogActions
+      child => React.isValidElement(child) && child.type === DialogActions
     );
     const restOfChildren = childrenArray.filter(
       child =>
-        /* $FlowFixMe */
-        child && child.type !== DialogActions && child.type !== DialogTitle
+        React.isValidElement(child) &&
+        child.type !== DialogActions &&
+        child.type !== DialogTitle
     );
     let restOfChildrenWithoutTitle = restOfChildren;
     if (!title) {
       let found = false;
       restOfChildrenWithoutTitle = restOfChildren.map(child => {
-        if (child.type === DialogContent && !found) {
+        if (
+          React.isValidElement(child) &&
+          child.type === DialogContent &&
+          !found
+        ) {
           found = true;
-          /* $FlowFixMe */
           return React.cloneElement(child, {
             style: { paddingTop: 24 },
           });
diff --git a/src/components/Dialog/DialogActions.js b/src/components/Dialog/DialogActions.js
index 2dab130..0d6eced 100644
--- a/src/components/Dialog/DialogActions.js
+++ b/src/components/Dialog/DialogActions.js
@@ -46,9 +46,8 @@ const DialogActions = (props: Props) => (
     {React.Children.map(
       props.children,
       child =>
-        typeof child === 'object' && child !== null
-          ? /* $FlowFixMe */
-            React.cloneElement(child, {
+        React.isValidElement(child)
+          ? React.cloneElement(child, {
               compact: true,
             })
           : child
diff --git a/src/components/List/ListAccordion.js b/src/components/List/ListAccordion.js
index bce7e7d..a9d82fa 100644
--- a/src/components/List/ListAccordion.js
+++ b/src/components/List/ListAccordion.js
@@ -154,7 +154,12 @@ class ListAccordion extends React.Component<Props, State> {
         </TouchableRipple>
         {this.state.expanded
           ? React.Children.map(children, child => {
-              if (icon && child && !child.props.icon && !child.props.avatar) {
+              if (
+                icon &&
+                React.isValidElement(child) &&
+                !child.props.icon &&
+                !child.props.avatar
+              ) {
                 return React.cloneElement(child, {
                   style: [styles.child, child.props.style],
                 });
diff --git a/src/components/Toolbar/Toolbar.js b/src/components/Toolbar/Toolbar.js
index 5d9b880..cce8e18 100644
--- a/src/components/Toolbar/Toolbar.js
+++ b/src/components/Toolbar/Toolbar.js
@@ -137,9 +137,16 @@ class Toolbar extends React.Component<Props> {
 
     if (Platform.OS === 'ios') {
       childrenArray.forEach(child => {
-        if (!isToolbarContentFound && child.type !== ToolbarContent) {
+        if (
+          !isToolbarContentFound &&
+          React.isValidElement(child) &&
+          child.type !== ToolbarContent
+        ) {
           leftActions++;
-        } else if (child.type === ToolbarContent) {
+        } else if (
+          React.isValidElement(child) &&
+          child.type === ToolbarContent
+        ) {
           isToolbarContentFound = true;
         } else {
           rightActions++;
@@ -172,25 +179,27 @@ class Toolbar extends React.Component<Props> {
         {...rest}
       >
         <View style={[{ height, marginTop: statusBarHeight }, styles.wrapper]}>
-          {childrenArray.filter(Boolean).map((child: any, i) => {
-            const props: { dark: ?boolean, style?: any } = {
-              dark:
-                typeof child.props.dark === 'undefined'
-                  ? isDark
-                  : child.props.dark,
-            };
+          {childrenArray
+            .filter(child => React.isValidElement(child))
+            .map((child: any, i) => {
+              const props: { dark: ?boolean, style?: any } = {
+                dark:
+                  typeof child.props.dark === 'undefined'
+                    ? isDark
+                    : child.props.dark,
+              };
 
-            if (child.type === ToolbarContent) {
-              // Extra margin between left icon and ToolbarContent
-              props.style = [
-                { marginHorizontal: i === 0 ? 0 : 8 },
-                centerIos && { alignItems: 'center' },
-                child.props.style,
-              ];
-            }
+              if (child.type === ToolbarContent) {
+                // Extra margin between left icon and ToolbarContent
+                props.style = [
+                  { marginHorizontal: i === 0 ? 0 : 8 },
+                  centerIos && { alignItems: 'center' },
+                  child.props.style,
+                ];
+              }
 
-            return React.cloneElement(child, props);
-          })}
+              return React.cloneElement(child, props);
+            })}
         </View>
       </Wrapper>
     );