diff --git a/src/com/massivecraft/massivecore/command/editor/CommandEditAbstract.java b/src/com/massivecraft/massivecore/command/editor/CommandEditAbstract.java
index 9010e610..0af87bcf 100644
--- a/src/com/massivecraft/massivecore/command/editor/CommandEditAbstract.java
+++ b/src/com/massivecraft/massivecore/command/editor/CommandEditAbstract.java
@@ -249,4 +249,10 @@ public class CommandEditAbstract<O, V> extends MassiveCommand
 		msg("%s<silver> for %s<silver>: %s", descProperty, descObject, descValue);
 	}
 	
+	public void requireNullable() throws MassiveException
+	{
+		if (this.getProperty().isNullable()) return;
+		throw new MassiveException().addMsg("<h>%s<b> can not be null.", this.getPropertyName());
+	}
+	
 }
diff --git a/src/com/massivecraft/massivecore/command/editor/CommandEditCollection.java b/src/com/massivecraft/massivecore/command/editor/CommandEditCollection.java
index 1fb905a9..e51e3b8d 100644
--- a/src/com/massivecraft/massivecore/command/editor/CommandEditCollection.java
+++ b/src/com/massivecraft/massivecore/command/editor/CommandEditCollection.java
@@ -15,8 +15,12 @@ public class CommandEditCollection<O, V extends Collection<?>> extends CommandEd
 		
 		// Children
 		this.addChild(new CommandEditShow<O, V>(settings, property));
-		this.addChild(new CommandEditCreate<O, V>(settings, property));
-		this.addChild(new CommandEditDelete<O, V>(settings, property));
+		
+		if (property.isNullable())
+		{
+			this.addChild(new CommandEditCreate<O, V>(settings, property));
+			this.addChild(new CommandEditDelete<O, V>(settings, property));
+		}
 		
 		this.addChild(new CommandEditCollectionAdd<O, V>(settings, property));
 		this.addChild(new CommandEditCollectionInsert<O, V>(settings, property));
diff --git a/src/com/massivecraft/massivecore/command/editor/CommandEditItemStacks.java b/src/com/massivecraft/massivecore/command/editor/CommandEditItemStacks.java
index dc5c05a6..ddc7f3c9 100644
--- a/src/com/massivecraft/massivecore/command/editor/CommandEditItemStacks.java
+++ b/src/com/massivecraft/massivecore/command/editor/CommandEditItemStacks.java
@@ -17,8 +17,13 @@ public class CommandEditItemStacks<O> extends CommandEditAbstract<O, List<ItemSt
 		
 		// Children
 		this.addChild(new CommandEditShow<O, List<ItemStack>>(settings, property));
-		this.addChild(new CommandEditCreate<O, List<ItemStack>>(settings, property));
-		this.addChild(new CommandEditDelete<O, List<ItemStack>>(settings, property));
+		
+		if (property.isNullable())
+		{
+			this.addChild(new CommandEditCreate<O, List<ItemStack>>(settings, property));
+			this.addChild(new CommandEditDelete<O, List<ItemStack>>(settings, property));
+		}
+		
 		this.addChild(new CommandEditItemStacksOpen<O>(settings, property));
 	}
 	
diff --git a/src/com/massivecraft/massivecore/command/editor/CommandEditMap.java b/src/com/massivecraft/massivecore/command/editor/CommandEditMap.java
index fd008756..1d76a6f1 100644
--- a/src/com/massivecraft/massivecore/command/editor/CommandEditMap.java
+++ b/src/com/massivecraft/massivecore/command/editor/CommandEditMap.java
@@ -15,8 +15,12 @@ public class CommandEditMap<O, V extends Map<?, ?>> extends CommandEditAbstract<
 		
 		// Children
 		this.addChild(new CommandEditShow<O, V>(settings, property));
-		this.addChild(new CommandEditCreate<O, V>(settings, property));
-		this.addChild(new CommandEditDelete<O, V>(settings, property));
+		
+		if (property.isNullable())
+		{
+			this.addChild(new CommandEditCreate<O, V>(settings, property));
+			this.addChild(new CommandEditDelete<O, V>(settings, property));
+		}
 		
 		this.addChild(new CommandEditMapPut<O, V>(settings, property));
 		this.addChild(new CommandEditMapRemove<O, V>(settings, property));
diff --git a/src/com/massivecraft/massivecore/command/editor/CommandEditSimple.java b/src/com/massivecraft/massivecore/command/editor/CommandEditSimple.java
index 2c4b90f3..a50db327 100644
--- a/src/com/massivecraft/massivecore/command/editor/CommandEditSimple.java
+++ b/src/com/massivecraft/massivecore/command/editor/CommandEditSimple.java
@@ -39,6 +39,9 @@ public class CommandEditSimple<O, V> extends CommandEditAbstract<O, V>
 		// Arguments
 		V after = this.readArg();
 		
+		// Validate
+		if (after == null) this.requireNullable();
+		
 		// Apply
 		this.attemptSet(after);
 	}
diff --git a/src/com/massivecraft/massivecore/command/editor/Property.java b/src/com/massivecraft/massivecore/command/editor/Property.java
index 7e08a3d3..9ae90976 100644
--- a/src/com/massivecraft/massivecore/command/editor/Property.java
+++ b/src/com/massivecraft/massivecore/command/editor/Property.java
@@ -43,6 +43,10 @@ public abstract class Property<O, V> implements Named
 	public boolean isEditable() { return this.editable; }
 	public void setEditable(boolean editable) { this.editable = editable; }
 	
+	protected boolean nullable = true;
+	public boolean isNullable() { return this.nullable; }
+	public void setNullable(boolean nullable) { this.nullable = nullable; }
+	
 	// -------------------------------------------- //
 	// NAME
 	// -------------------------------------------- //