diff --git a/src/components/mdTabs/mdTabs.vue b/src/components/mdTabs/mdTabs.vue
index b171461..b22818b 100644
--- a/src/components/mdTabs/mdTabs.vue
+++ b/src/components/mdTabs/mdTabs.vue
@@ -208,7 +208,14 @@
       });
     },
     beforeDestroy() {
-      this.contentObserver.disconnect();
+      if (this.contentObserver) {
+        this.contentObserver.disconnect();
+      }
+
+      if (this.navigationObserver) {
+        this.navigationObserver.disconnect();
+      }
+
       window.removeEventListener('resize', this.calculateOnWatch);
     }
   };
diff --git a/src/components/mdTooltip/mdTooltip.vue b/src/components/mdTooltip/mdTooltip.vue
index c42a74f..5a0b1bd 100644
--- a/src/components/mdTooltip/mdTooltip.vue
+++ b/src/components/mdTooltip/mdTooltip.vue
@@ -108,7 +108,7 @@
       generateTooltipClasses() {
         let classes = [];
 
-        this.parentElement.classList.forEach((cssClass) => {
+        [...this.parentElement.classList].forEach((cssClass) => {
           if (cssClass.indexOf('md-') >= 0 && cssClass !== 'md-active') {
             classes.push(cssClass + '-tooltip');
           }