diff --git a/cmake/modules/NSIS.template.in b/cmake/modules/NSIS.template.in
index 98d5a3df69..8e1b8a5dea 100644
--- a/cmake/modules/NSIS.template.in
+++ b/cmake/modules/NSIS.template.in
@@ -741,6 +741,8 @@ Function .onInit
          Quit
       ${EndSwitch}
 
+   ClearError
+
    ;Prevent multiple instances.
    System::Call 'kernel32::CreateMutexA(i 0, i 0, t "${APPLICATION_SHORTNAME}Installer") i .r1 ?e'
    Pop $R0
@@ -806,6 +808,8 @@ Function un.onInit
          Quit
       ${EndSwitch}
 
+   ClearError
+
    ;Prevent multiple instances.
    System::Call 'kernel32::CreateMutexA(i 0, i 0, t "${APPLICATION_SHORTNAME}Uninstaller") i .r1 ?e'
    Pop $R0