diff --git a/src/bacnet/basic/object/ao.c b/src/bacnet/basic/object/ao.c
index 34b664a1..22bef07a 100644
--- a/src/bacnet/basic/object/ao.c
+++ b/src/bacnet/basic/object/ao.c
@@ -1279,5 +1279,7 @@ void Analog_Output_Cleanup(void)
  */
 void Analog_Output_Init(void)
 {
-    Object_List = Keylist_Create();
+    if (!Object_List) {
+        Object_List = Keylist_Create();
+    }
 }
diff --git a/src/bacnet/basic/object/blo.c b/src/bacnet/basic/object/blo.c
index 6cafef62..415afafe 100644
--- a/src/bacnet/basic/object/blo.c
+++ b/src/bacnet/basic/object/blo.c
@@ -1554,5 +1554,7 @@ void Binary_Lighting_Output_Cleanup(void)
  */
 void Binary_Lighting_Output_Init(void)
 {
-    Object_List = Keylist_Create();
+    if (!Object_List) {
+        Object_List = Keylist_Create();
+    }
 }
diff --git a/src/bacnet/basic/object/bo.c b/src/bacnet/basic/object/bo.c
index 92014da5..e70b24cc 100644
--- a/src/bacnet/basic/object/bo.c
+++ b/src/bacnet/basic/object/bo.c
@@ -1231,5 +1231,7 @@ bool Binary_Output_Delete(uint32_t object_instance)
  */
 void Binary_Output_Init(void)
 {
-    Object_List = Keylist_Create();
+    if (!Object_List) {
+        Object_List = Keylist_Create();
+    }
 }
diff --git a/src/bacnet/basic/object/bv.c b/src/bacnet/basic/object/bv.c
index 132e989e..28cd5309 100644
--- a/src/bacnet/basic/object/bv.c
+++ b/src/bacnet/basic/object/bv.c
@@ -1006,5 +1006,7 @@ bool Binary_Value_Delete(uint32_t object_instance)
  */
 void Binary_Value_Init(void)
 {
-    Object_List = Keylist_Create();
+    if (!Object_List) {
+        Object_List = Keylist_Create();
+    }
 }