diff --git a/src/test/java/com/google/gwtorm/schema/sql/DialectMySQLTest.java b/src/test/java/com/google/gwtorm/schema/sql/DialectMySQLTest.java
index 186134a..4f0b255 100644
--- a/src/test/java/com/google/gwtorm/schema/sql/DialectMySQLTest.java
+++ b/src/test/java/com/google/gwtorm/schema/sql/DialectMySQLTest.java
@@ -81,6 +81,10 @@
 
   @After
   public void tearDown() {
+    if (executor == null) {
+      return;
+    }
+
     // Database content must be flushed because
     // tests assume that the database is empty
     drop("TABLE address_id");
diff --git a/src/test/java/com/google/gwtorm/schema/sql/DialectOracleSQLTest.java b/src/test/java/com/google/gwtorm/schema/sql/DialectOracleSQLTest.java
index 8f75bb1..b7d501c 100644
--- a/src/test/java/com/google/gwtorm/schema/sql/DialectOracleSQLTest.java
+++ b/src/test/java/com/google/gwtorm/schema/sql/DialectOracleSQLTest.java
@@ -80,6 +80,10 @@
 
   @After
   public void tearDown() {
+    if (executor == null) {
+      return;
+    }
+
     // Database content must be flushed because
     // tests assume that the database is empty
     drop("SEQUENCE address_id");
diff --git a/src/test/java/com/google/gwtorm/schema/sql/DialectPostgreSQLTest.java b/src/test/java/com/google/gwtorm/schema/sql/DialectPostgreSQLTest.java
index 0330b18..6922aa5 100644
--- a/src/test/java/com/google/gwtorm/schema/sql/DialectPostgreSQLTest.java
+++ b/src/test/java/com/google/gwtorm/schema/sql/DialectPostgreSQLTest.java
@@ -79,6 +79,10 @@
 
   @After
   public void tearDown() {
+    if (executor == null) {
+      return;
+    }
+
     // Database content must be flushed because
     // tests assume that the database is empty
     drop("SEQUENCE address_id");