diff --git a/revid/RevidInstance.go b/revid/RevidInstance.go
index 17a55c89..b25cded8 100644
--- a/revid/RevidInstance.go
+++ b/revid/RevidInstance.go
@@ -172,6 +172,10 @@ func (r *revidInst) ErrOut(m string){
 }
 
 func (r *revidInst) Start() {
+	if r.isRunning {
+		r.ErrOut("Start() has been called but revid already running!")
+		return
+	}
 	r.ErrOut("Starting Revid!")
 	switch r.config.Input {
 	case Raspivid: