diff --git a/common/src/main/java/io/bitsquare/common/DefaultJavaTimer.java b/common/src/main/java/io/bitsquare/common/DefaultJavaTimer.java
index de6636b789..55f8ab7d24 100644
--- a/common/src/main/java/io/bitsquare/common/DefaultJavaTimer.java
+++ b/common/src/main/java/io/bitsquare/common/DefaultJavaTimer.java
@@ -17,7 +17,7 @@ public class DefaultJavaTimer implements Timer {
 
     @Override
     public Timer runLater(Duration delay, Runnable runnable) {
-        if (timer != null) {
+        if (timer == null) {
             timer = new java.util.Timer();
             timer.schedule(new TimerTask() {
                 @Override
@@ -39,7 +39,7 @@ public class DefaultJavaTimer implements Timer {
 
     @Override
     public Timer runPeriodically(java.time.Duration interval, Runnable runnable) {
-        if (timer != null) {
+        if (timer == null) {
             timer = new java.util.Timer();
             timer.scheduleAtFixedRate(new TimerTask() {
                 @Override
diff --git a/gui/src/main/java/io/bitsquare/gui/common/UITimer.java b/gui/src/main/java/io/bitsquare/gui/common/UITimer.java
index 1f7d06a7e0..ccd3c844f3 100644
--- a/gui/src/main/java/io/bitsquare/gui/common/UITimer.java
+++ b/gui/src/main/java/io/bitsquare/gui/common/UITimer.java
@@ -16,7 +16,7 @@ public class UITimer implements Timer {
 
     @Override
     public Timer runLater(Duration delay, Runnable runnable) {
-        if (timer != null) {
+        if (timer == null) {
             timer = FxTimer.create(delay, runnable);
             timer.restart();
         } else {
@@ -27,7 +27,7 @@ public class UITimer implements Timer {
 
     @Override
     public Timer runPeriodically(Duration interval, Runnable runnable) {
-        if (timer != null) {
+        if (timer == null) {
             timer = FxTimer.createPeriodic(interval, runnable);
             timer.restart();
         } else {