diff --git a/pom.xml b/pom.xml
index 495383c..f2d1eb8 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,12 +1,10 @@
-<project
-	xmlns="http://maven.apache.org/POM/4.0.0" 
-	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>de.kreth</groupId>
 	<artifactId>databasedefinition</artifactId>
-	<version>0.0.7-SNAPSHOT</version>
+	<version>0.0.6</version>
 	<name>DatabaseDefinition</name>
 	<description>Database creation and definition framework</description>
 
@@ -30,9 +28,9 @@
 			<plugin>
 				<artifactId>maven-release-plugin</artifactId>
 				<version>2.5.2</version>
-<!-- 				<configuration> -->
-<!-- 					<goals>install</goals> -->
-<!-- 				</configuration> -->
+				<!-- <configuration> -->
+				<!-- <goals>install</goals> -->
+				<!-- </configuration> -->
 			</plugin>
 		</plugins>
 	</build>
diff --git a/src/main/java/de/kreth/dbmanager/DbManager.java b/src/main/java/de/kreth/dbmanager/DbManager.java
index 879ec32..cbbebff 100644
--- a/src/main/java/de/kreth/dbmanager/DbManager.java
+++ b/src/main/java/de/kreth/dbmanager/DbManager.java
@@ -108,6 +108,7 @@ public class DbManager {
 	}
 
 	public static String createSqlStatement(TableDefinition def) {
+		assert(def != null);
 
 		StringBuilder sql = new StringBuilder();
 		sql.append("CREATE TABLE ").append(def.getTableName()).append(" (\n");
@@ -165,7 +166,7 @@ public class DbManager {
 	}
 
 	public static String createSqlAddColumns(TableDefinition current, ColumnDefinition... columnsToAdd) {
-
+		assert(current != null);
 		StringBuilder sql = new StringBuilder();
 		sql.append("ALTER TABLE ").append(current.getTableName());
 
@@ -189,6 +190,7 @@ public class DbManager {
 	}
 	
 	public static String createSqlDropColumns(TableDefinition current, ColumnDefinition... columnsToDrop) {
+		assert(current != null);
 
 		StringBuilder sql = new StringBuilder();
 		sql.append("ALTER TABLE ").append(current.getTableName());
@@ -201,12 +203,8 @@ public class DbManager {
 			}
 
 			first = false;
-			sql.append("\n\tDROP COLUMN ").append(col.getColumnName()).append(" ");
-			appendType(sql, col);
+			sql.append("\n\tDROP COLUMN ").append(col.getColumnName());
 
-			if (col.getColumnParameters() != null && !col.getColumnParameters().isEmpty()) {
-				sql.append(" ").append(col.getColumnParameters());
-			}
 		}
 		sql.append(";");
 		return sql.toString();