diff --git a/pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/state/SetLineCapStyle.java b/pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/state/SetLineCapStyle.java
index 5babf840ab9..0d970b65731 100644
--- a/pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/state/SetLineCapStyle.java
+++ b/pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/state/SetLineCapStyle.java
@@ -45,6 +45,10 @@ public void process(Operator operator, List<COSBase> arguments) throws IOExcepti
         {
             throw new MissingOperandException(operator, arguments);
         }
+        if (!checkArrayTypesClass(arguments, COSNumber.class))
+        {
+            return;
+        }
         int lineCapStyle = ((COSNumber)arguments.get( 0 )).intValue();
         getContext().getGraphicsState().setLineCap(lineCapStyle);
     }
diff --git a/pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/state/SetLineJoinStyle.java b/pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/state/SetLineJoinStyle.java
index 672ab7e73f9..fbfa40a66fc 100644
--- a/pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/state/SetLineJoinStyle.java
+++ b/pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/state/SetLineJoinStyle.java
@@ -47,6 +47,10 @@ public void process(Operator operator, List<COSBase> arguments) throws IOExcepti
         {
             throw new MissingOperandException(operator, arguments);
         }
+        if (!checkArrayTypesClass(arguments, COSNumber.class))
+        {
+            return;
+        }
         int lineJoinStyle = ((COSNumber)arguments.get( 0 )).intValue();
         getContext().getGraphicsState().setLineJoin(lineJoinStyle);
     }
diff --git a/pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/state/SetLineMiterLimit.java b/pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/state/SetLineMiterLimit.java
index 9ea935c876c..016fa8d972c 100644
--- a/pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/state/SetLineMiterLimit.java
+++ b/pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/state/SetLineMiterLimit.java
@@ -46,6 +46,10 @@ public void process(Operator operator, List<COSBase> arguments) throws IOExcepti
         {
             throw new MissingOperandException(operator, arguments);
         }
+        if (!checkArrayTypesClass(arguments, COSNumber.class))
+        {
+            return;
+        }
         COSNumber miterLimit = (COSNumber)arguments.get( 0 );
         getContext().getGraphicsState().setMiterLimit(miterLimit.floatValue());
     }
diff --git a/pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/state/SetLineWidth.java b/pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/state/SetLineWidth.java
index 1ac6c4ca685..bd38fd69e4d 100644
--- a/pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/state/SetLineWidth.java
+++ b/pdfbox/src/main/java/org/apache/pdfbox/contentstream/operator/state/SetLineWidth.java
@@ -47,6 +47,10 @@ public void process(Operator operator, List<COSBase> arguments) throws IOExcepti
         {
             throw new MissingOperandException(operator, arguments);
         }
+        if (!checkArrayTypesClass(arguments, COSNumber.class))
+        {
+            return;
+        }
         COSNumber width = (COSNumber) arguments.get(0);
         getContext().getGraphicsState().setLineWidth(width.floatValue());
     }