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-rw-r--r--src/main/java/org/traccar/model/ExtendedModel.java3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/main/java/org/traccar/model/ExtendedModel.java b/src/main/java/org/traccar/model/ExtendedModel.java
index 6a4f502f7..d5cd094da 100644
--- a/src/main/java/org/traccar/model/ExtendedModel.java
+++ b/src/main/java/org/traccar/model/ExtendedModel.java
@@ -91,7 +91,8 @@ public class ExtendedModel extends BaseModel {
public String getString(String key, String defaultValue) {
if (attributes.containsKey(key)) {
- return attributes.get(key).toString();
+ Object value = attributes.get(key);
+ return value != null ? value.toString() : null;
} else {
return defaultValue;
}