diff --git a/models/db.go b/models/db.go
index 2056fc6..1676905 100644
--- a/models/db.go
+++ b/models/db.go
@@ -85,9 +85,9 @@ const createAudit string = `
 		AuditId INTEGER PRIMARY KEY AUTOINCREMENT,
 		UserId INTEGER DEFAULT 0,
 		SecretId INTEGER DEFAULT 0,
-		EventText VARCHAR,
-		IpAddress VARCHAR,
-		EventTime datetime
+		EventText VARCHAR DEFAULT '',
+		IpAddress VARCHAR DEFAULT '',
+		EventTime datetime DEFAULT (datetime('1970-01-01 00:00:00'))
 	);
 `
 
@@ -405,6 +405,11 @@ func CreateTables() {
 			log.Printf("Error altering audit table to add IpAddress column : '%s'\n", err)
 			os.Exit(1)
 		}
+
+		if _, err = db.Exec("UPDATE audit SET IpAddress = '' WHERE IpAddress is null;"); err != nil {
+			log.Printf("Error setting IpAddress of existing audit records : '%s'", err)
+			os.Exit(1)
+		}
 	}
 }