diff --git a/CHANGELOG.md b/CHANGELOG.md
index f7cd6d8d4..f52221119 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,8 @@ All notable changes to this project will be documented in this file.
 This project uses the changelog in accordance with [keepchangelog](http://keepachangelog.com/). Please use this to write notable changes, which is not the same as git commit log...
 
 ## [unreleased][unreleased]
+
+## [midsummer][2021-06-25]
  - Added bruteforce function for the magic byte in `cmdlfnexwatch.c` and ability to clone with psk2 modulation (@Guilhem7, @MaximeBosca)
  - Changed `hw setmux` - improve user feedback for special case (@iceman1001)
  - Changed 'filename' - unified file name param across client (@iceman1001)
diff --git a/client/src/cmdlfem4x50.c b/client/src/cmdlfem4x50.c
index 0861365a9..a67ffbc7e 100644
--- a/client/src/cmdlfem4x50.c
+++ b/client/src/cmdlfem4x50.c
@@ -471,6 +471,8 @@ int CmdEM4x50Chk(const char *Cmd) {
         return res;
     }
 
+    uint8_t *pkeys = keys;
+
     uint64_t t1 = msclock();
 
     PrintAndLogEx(INFO, "You can cancel this operation by pressing the pm3 button");
@@ -505,7 +507,7 @@ int CmdEM4x50Chk(const char *Cmd) {
         keys += n;
     }
 
-    free(keys);
+    free(pkeys);
     PrintAndLogEx(NORMAL, "");
 
     if (status == PM3_SUCCESS) {