diff --git a/cli/htmgo/tasks/process/pid_unix.go b/cli/htmgo/tasks/process/pid_unix.go
index d85321c..95ad994 100644
--- a/cli/htmgo/tasks/process/pid_unix.go
+++ b/cli/htmgo/tasks/process/pid_unix.go
@@ -10,6 +10,9 @@ import (
 )
 
 func KillProcess(process *os.Process) error {
+	if process == nil {
+		return nil
+	}
 	return syscall.Kill(-process.Pid, syscall.SIGKILL)
 }
 
diff --git a/cli/htmgo/tasks/process/pid_windows.go b/cli/htmgo/tasks/process/pid_windows.go
index 4dcb74a..3a79bbe 100644
--- a/cli/htmgo/tasks/process/pid_windows.go
+++ b/cli/htmgo/tasks/process/pid_windows.go
@@ -7,6 +7,9 @@ import (
 import "golang.org/x/sys/windows"
 
 func KillProcess(process *os.Process) error {
+	if process == nil {
+		return nil
+	}
 	return process.Kill()
 }