diff --git a/core/src/main/java/io/jenkins/pluginhealth/scoring/probes/CodeCoverageProbe.java b/core/src/main/java/io/jenkins/pluginhealth/scoring/probes/CodeCoverageProbe.java
index 63823d5a4..7889910f4 100644
--- a/core/src/main/java/io/jenkins/pluginhealth/scoring/probes/CodeCoverageProbe.java
+++ b/core/src/main/java/io/jenkins/pluginhealth/scoring/probes/CodeCoverageProbe.java
@@ -60,6 +60,9 @@ public class CodeCoverageProbe extends Probe {
     protected ProbeResult doApply(Plugin plugin, ProbeContext context) {
         final io.jenkins.pluginhealth.scoring.model.updatecenter.Plugin ucPlugin =
             context.getUpdateCenter().plugins().get(plugin.getName());
+        if (ucPlugin == null) {
+            return error("Plugin cannot be found in Update-Center.");
+        }
         final String defaultBranch = ucPlugin.defaultBranch();
         if (defaultBranch == null || defaultBranch.isBlank()) {
             return this.error("No default branch configured for the plugin.");
diff --git a/core/src/main/java/io/jenkins/pluginhealth/scoring/probes/SpotBugsProbe.java b/core/src/main/java/io/jenkins/pluginhealth/scoring/probes/SpotBugsProbe.java
index 8a398cd1a..3947976c3 100644
--- a/core/src/main/java/io/jenkins/pluginhealth/scoring/probes/SpotBugsProbe.java
+++ b/core/src/main/java/io/jenkins/pluginhealth/scoring/probes/SpotBugsProbe.java
@@ -50,6 +50,9 @@ public class SpotBugsProbe extends Probe {
     protected ProbeResult doApply(Plugin plugin, ProbeContext context) {
         final io.jenkins.pluginhealth.scoring.model.updatecenter.Plugin ucPlugin =
             context.getUpdateCenter().plugins().get(plugin.getName());
+        if (ucPlugin == null) {
+            return error("Plugin cannot be found in Update-Center.");
+        }
         final String defaultBranch = ucPlugin.defaultBranch();
         if (defaultBranch == null || defaultBranch.isBlank()) {
             return this.error("No default branch configured for the plugin.");