diff --git a/external/mdds/UnpackedTarball_mdds.mk b/external/mdds/UnpackedTarball_mdds.mk
index c015f4c13f5a..bd57593e7d45 100644
--- a/external/mdds/UnpackedTarball_mdds.mk
+++ b/external/mdds/UnpackedTarball_mdds.mk
@@ -14,6 +14,7 @@ $(eval $(call gb_UnpackedTarball_set_tarball,mdds,$(MDDS_TARBALL)))
 $(eval $(call gb_UnpackedTarball_set_patchlevel,mdds,0))
 
 $(eval $(call gb_UnpackedTarball_add_patches,mdds,\
+        external/mdds/tdf90579.patch.0 \
 ))
 
 # vim: set noet sw=4 ts=4:
diff --git a/external/mdds/tdf90579.patch.0 b/external/mdds/tdf90579.patch.0
new file mode 100644
index 000000000000..5ef1bc74097d
--- /dev/null
+++ b/external/mdds/tdf90579.patch.0
@@ -0,0 +1,23 @@
+diff --git a/include/mdds/multi_type_vector_def.inl b/include/mdds/multi_type_vector_def.inl
+index 0e2a15a..fe9c767 100644
+--- include/mdds/multi_type_vector_def.inl
++++ include/mdds/multi_type_vector_def.inl
+@@ -2306,6 +2306,9 @@ void multi_type_vector<_CellBlockFunc, _EventFunc>::swap_single_to_multi_blocks(
+     {
+         // Source range is at the top of a block.
+ 
++        // Shrink the current block by erasing the top part.
++        element_block_func::erase(*blk_src->mp_data, 0, len);
++
+         if (src_tail_len == 0)
+         {
+             // the whole block needs to be replaced.
+@@ -2314,8 +2317,6 @@ void multi_type_vector<_CellBlockFunc, _EventFunc>::swap_single_to_multi_blocks(
+         }
+         else
+         {
+-            // Shrink the current block by erasing the top part.
+-            element_block_func::erase(*blk_src->mp_data, 0, len);
+             blk_src->m_size -= len;
+         }
+