diff --git a/ZenLib/Source/ZenLib/ZtringList.cpp b/ZenLib/Source/ZenLib/ZtringList.cpp
index a58f9fd..e9a3a73 100644
--- a/ZenLib/Source/ZenLib/ZtringList.cpp
+++ b/ZenLib/Source/ZenLib/ZtringList.cpp
@@ -113,6 +113,8 @@ ZtringList &ZtringList::operator+= (const ZtringList &Source)
 // Operator =
 ZtringList &ZtringList::operator= (const ZtringList &Source)
 {
+    if (this == &Source)
+       return *this;
     clear();
     Ztring C=Separator[0];
     Ztring Q=Quote;
diff --git a/ZenLib/Source/ZenLib/ZtringListList.cpp b/ZenLib/Source/ZenLib/ZtringListList.cpp
index 0b7585a..54c6a94 100644
--- a/ZenLib/Source/ZenLib/ZtringListList.cpp
+++ b/ZenLib/Source/ZenLib/ZtringListList.cpp
@@ -131,6 +131,8 @@ ZtringListList &ZtringListList::operator+= (const ZtringListList &Source)
 // Operator =
 ZtringListList &ZtringListList::operator= (const ZtringListList &Source)
 {
+    if (this == &Source)
+        return *this;
     clear();
 
     reserve(Source.size());