--- a/nix/libstore/build.cc.orig	2019-05-03 14:25:15.000000000 +0200
+++ b/nix/libstore/build.cc	2019-09-02 17:53:29.000000000 +0200
@@ -492,7 +492,7 @@
 
 void UserLock::acquire()
 {
-    assert(uid == 0);
+  //    assert(uid == 0);
 
     assert(settings.buildUsersGroup != "");
 
@@ -571,9 +571,9 @@
 
 void UserLock::release()
 {
-    if (uid == 0) return;
+  //    if (uid == 0) return;
     fdUserLock.close(); /* releases lock */
-    assert(lockedPaths.find(fnUserLock) != lockedPaths.end());
+    //    assert(lockedPaths.find(fnUserLock) != lockedPaths.end());
     lockedPaths.erase(fnUserLock);
     fnUserLock = "";
     uid = 0;