diff --git a/docs/UserGuide.md b/docs/UserGuide.md
index 05624d1f527..81cc47ee323 100644
--- a/docs/UserGuide.md
+++ b/docs/UserGuide.md
@@ -139,8 +139,8 @@ Format: `add-image INDEX ai/[PATH-TO-IMAGE]`
 
 Examples:
 
-* `list` followed by `add-image 2 C:/Users/user/Downloads/weekiat.png` adds the image `weekiat.png` to the 2nd person 
-in the address book
+* `list` followed by `add-image 2 ai/C:/Users/user/Downloads/weekiat.png` adds the image `weekiat.png` to the 2nd person in the address book
+
 
 ### Delete an Image for contacts
 
diff --git a/src/main/java/seedu/address/model/tag/Tag.java b/src/main/java/seedu/address/model/tag/Tag.java
index 6ded08347fb..1ebb95099ed 100644
--- a/src/main/java/seedu/address/model/tag/Tag.java
+++ b/src/main/java/seedu/address/model/tag/Tag.java
@@ -34,6 +34,7 @@ public static boolean isValidTagName(String test) {
     }
 
     public String getTagName() {
+        assert tagName != null : "Tag object with null tagName!";
         String[] splitTag = this.tagName.split("XXXXX");
         if (splitTag.length == 1) {
             return splitTag[0];