diff --git a/src/Classifiers/AdaBoost.php b/src/Classifiers/AdaBoost.php
index bc4aff1ea..5aaf5880e 100644
--- a/src/Classifiers/AdaBoost.php
+++ b/src/Classifiers/AdaBoost.php
@@ -494,7 +494,7 @@ public function __serialize() : array
     {
         $properties = get_object_vars($this);
 
-        unset($properties['losses']);
+        unset($properties['losses'], $properties['logger']);
 
         return $properties;
     }
diff --git a/src/Classifiers/LogisticRegression.php b/src/Classifiers/LogisticRegression.php
index fd96596ee..f73b1692f 100644
--- a/src/Classifiers/LogisticRegression.php
+++ b/src/Classifiers/LogisticRegression.php
@@ -475,7 +475,7 @@ public function __serialize() : array
     {
         $properties = get_object_vars($this);
 
-        unset($properties['losses']);
+        unset($properties['losses'], $properties['logger']);
 
         return $properties;
     }
diff --git a/src/Classifiers/LogitBoost.php b/src/Classifiers/LogitBoost.php
index 8a39be711..862e163bd 100644
--- a/src/Classifiers/LogitBoost.php
+++ b/src/Classifiers/LogitBoost.php
@@ -657,7 +657,7 @@ public function __serialize() : array
     {
         $properties = get_object_vars($this);
 
-        unset($properties['losses'], $properties['scores']);
+        unset($properties['losses'], $properties['scores'], $properties['logger']);
 
         return $properties;
     }
diff --git a/src/Classifiers/MultilayerPerceptron.php b/src/Classifiers/MultilayerPerceptron.php
index a943ebef9..d7822446a 100644
--- a/src/Classifiers/MultilayerPerceptron.php
+++ b/src/Classifiers/MultilayerPerceptron.php
@@ -574,7 +574,7 @@ public function __serialize() : array
     {
         $properties = get_object_vars($this);
 
-        unset($properties['losses'], $properties['scores']);
+        unset($properties['losses'], $properties['scores'], $properties['logger']);
 
         return $properties;
     }
diff --git a/src/Classifiers/SoftmaxClassifier.php b/src/Classifiers/SoftmaxClassifier.php
index e10054119..beb212afe 100644
--- a/src/Classifiers/SoftmaxClassifier.php
+++ b/src/Classifiers/SoftmaxClassifier.php
@@ -439,7 +439,7 @@ public function __serialize() : array
     {
         $properties = get_object_vars($this);
 
-        unset($properties['losses']);
+        unset($properties['losses'], $properties['logger']);
 
         return $properties;
     }
diff --git a/src/Clusterers/FuzzyCMeans.php b/src/Clusterers/FuzzyCMeans.php
index 106a17725..01e2d4b02 100644
--- a/src/Clusterers/FuzzyCMeans.php
+++ b/src/Clusterers/FuzzyCMeans.php
@@ -449,7 +449,7 @@ public function __serialize() : array
     {
         $properties = get_object_vars($this);
 
-        unset($properties['losses']);
+        unset($properties['losses'], $properties['logger']);
 
         return $properties;
     }
diff --git a/src/Clusterers/GaussianMixture.php b/src/Clusterers/GaussianMixture.php
index fbc5d5db1..6000d25c7 100644
--- a/src/Clusterers/GaussianMixture.php
+++ b/src/Clusterers/GaussianMixture.php
@@ -591,7 +591,7 @@ public function __serialize() : array
     {
         $properties = get_object_vars($this);
 
-        unset($properties['losses']);
+        unset($properties['losses'], $properties['logger']);
 
         return $properties;
     }
diff --git a/src/Clusterers/KMeans.php b/src/Clusterers/KMeans.php
index 420844d63..9566eac0f 100644
--- a/src/Clusterers/KMeans.php
+++ b/src/Clusterers/KMeans.php
@@ -551,7 +551,7 @@ public function __serialize() : array
     {
         $properties = get_object_vars($this);
 
-        unset($properties['losses']);
+        unset($properties['losses'], $properties['logger']);
 
         return $properties;
     }
diff --git a/src/Clusterers/MeanShift.php b/src/Clusterers/MeanShift.php
index e8ac31e53..3ab333ed1 100644
--- a/src/Clusterers/MeanShift.php
+++ b/src/Clusterers/MeanShift.php
@@ -515,7 +515,7 @@ public function __serialize() : array
     {
         $properties = get_object_vars($this);
 
-        unset($properties['losses']);
+        unset($properties['losses'], $properties['logger']);
 
         return $properties;
     }
diff --git a/src/Regressors/Adaline.php b/src/Regressors/Adaline.php
index fcaf06458..ecf87f958 100644
--- a/src/Regressors/Adaline.php
+++ b/src/Regressors/Adaline.php
@@ -439,7 +439,7 @@ public function __serialize() : array
     {
         $properties = get_object_vars($this);
 
-        unset($properties['losses']);
+        unset($properties['losses'], $properties['logger']);
 
         return $properties;
     }
diff --git a/src/Regressors/GradientBoost.php b/src/Regressors/GradientBoost.php
index 0c9ff95c3..fab386428 100644
--- a/src/Regressors/GradientBoost.php
+++ b/src/Regressors/GradientBoost.php
@@ -587,7 +587,7 @@ public function __serialize() : array
     {
         $properties = get_object_vars($this);
 
-        unset($properties['losses'], $properties['scores']);
+        unset($properties['losses'], $properties['scores'], $properties['logger']);
 
         return $properties;
     }
diff --git a/src/Regressors/MLPRegressor.php b/src/Regressors/MLPRegressor.php
index a9df840d9..3f93181e0 100644
--- a/src/Regressors/MLPRegressor.php
+++ b/src/Regressors/MLPRegressor.php
@@ -540,7 +540,7 @@ public function __serialize() : array
     {
         $properties = get_object_vars($this);
 
-        unset($properties['losses'], $properties['scores']);
+        unset($properties['losses'], $properties['scores'], $properties['logger']);
 
         return $properties;
     }