diff --git a/nebula/src/main/java/org/ldbcouncil/snb/impls/workloads/nebula/NebulaDbConnectionState.java b/nebula/src/main/java/org/ldbcouncil/snb/impls/workloads/nebula/NebulaDbConnectionState.java
index 1655e302c..488e247e6 100644
--- a/nebula/src/main/java/org/ldbcouncil/snb/impls/workloads/nebula/NebulaDbConnectionState.java
+++ b/nebula/src/main/java/org/ldbcouncil/snb/impls/workloads/nebula/NebulaDbConnectionState.java
@@ -38,8 +38,8 @@ public NebulaDbConnectionState(Map<String, String> properties, NebulaQueryStore
         password = properties.get("password");
         String endPoint = properties.get("endpoint");
         spaceName = properties.get("spaceName");
-        printErrors = Boolean.parseBoolean(properties.get("printErrors"));
-        int maxConnSize = Integer.parseInt(properties.get("max_conn_size"));
+        printErrors = Boolean.parseBoolean(properties.getOrDefault("printErrors", "false"));
+        int maxConnSize = Integer.parseInt(properties.getOrDefault("max_conn_size", "500"));
 
         NebulaPoolConfig nebulaPoolConfig = new NebulaPoolConfig();
         nebulaPoolConfig.setMaxConnSize(maxConnSize);