diff --git a/app/display/convert-edm/src/main/java/org/csstudio/opibuilder/converter/model/EdmAttribute.java b/app/display/convert-edm/src/main/java/org/csstudio/opibuilder/converter/model/EdmAttribute.java
index 6b78b53378..42cba53c7e 100644
--- a/app/display/convert-edm/src/main/java/org/csstudio/opibuilder/converter/model/EdmAttribute.java
+++ b/app/display/convert-edm/src/main/java/org/csstudio/opibuilder/converter/model/EdmAttribute.java
@@ -96,7 +96,7 @@ public int getValueCount() {
      * @return        Actual value appended (without quotations).
      */
     public String appendValue(String value) {
-        if(value.startsWith("\"")&&value.endsWith("\"")){
+        if(value.startsWith("\"") && value.endsWith("\"") && value.length() >= 2){
             value=value.substring(1, value.length()-1);
         }