diff --git a/ortools/linear_solver/samples/AssignmentMip.java b/ortools/linear_solver/samples/AssignmentMip.java
index 2ac41f0346..7e2a89c619 100644
--- a/ortools/linear_solver/samples/AssignmentMip.java
+++ b/ortools/linear_solver/samples/AssignmentMip.java
@@ -42,6 +42,10 @@ public class AssignmentMip {
     // [START solver]
     // Create the linear solver with the SCIP backend.
     MPSolver solver = MPSolver.createSolver("SCIP");
+    if (solver == null) {
+      System.out.println("Could not create solver SCIP");
+      return;
+    }
     // [END solver]
 
     // Variables
diff --git a/ortools/linear_solver/samples/BinPackingMip.java b/ortools/linear_solver/samples/BinPackingMip.java
index d0d4fc7f33..395f92d2f1 100644
--- a/ortools/linear_solver/samples/BinPackingMip.java
+++ b/ortools/linear_solver/samples/BinPackingMip.java
@@ -44,6 +44,10 @@ public class BinPackingMip {
     // [START solver]
     // Create the linear solver with the SCIP backend.
     MPSolver solver = MPSolver.createSolver("SCIP");
+    if (solver == null) {
+      System.out.println("Could not create solver SCIP");
+      return;
+    }
     // [END solver]
 
     // [START program_part2]
diff --git a/ortools/linear_solver/samples/MipVarArray.java b/ortools/linear_solver/samples/MipVarArray.java
index 94752b2749..d2c58fe71c 100644
--- a/ortools/linear_solver/samples/MipVarArray.java
+++ b/ortools/linear_solver/samples/MipVarArray.java
@@ -50,6 +50,10 @@ public class MipVarArray {
     // [START solver]
     // Create the linear solver with the SCIP backend.
     MPSolver solver = MPSolver.createSolver("SCIP");
+    if (solver == null) {
+      System.out.println("Could not create solver SCIP");
+      return;
+    }
     // [END solver]
 
     // [START program_part2]
diff --git a/ortools/linear_solver/samples/MultipleKnapsackMip.java b/ortools/linear_solver/samples/MultipleKnapsackMip.java
index a836b20645..0b06de136c 100644
--- a/ortools/linear_solver/samples/MultipleKnapsackMip.java
+++ b/ortools/linear_solver/samples/MultipleKnapsackMip.java
@@ -45,6 +45,10 @@ public class MultipleKnapsackMip {
     // [START solver]
     // Create the linear solver with the SCIP backend.
     MPSolver solver = MPSolver.createSolver("SCIP");
+    if (solver == null) {
+      System.out.println("Could not create solver SCIP");
+      return;
+    }
     // [END solver]
 
     // [START program_part2]
diff --git a/ortools/linear_solver/samples/SimpleMipProgram.java b/ortools/linear_solver/samples/SimpleMipProgram.java
index 3978c6b15a..e63a4cfe48 100644
--- a/ortools/linear_solver/samples/SimpleMipProgram.java
+++ b/ortools/linear_solver/samples/SimpleMipProgram.java
@@ -29,6 +29,10 @@ public class SimpleMipProgram {
     // [START solver]
     // Create the linear solver with the SCIP backend.
     MPSolver solver = MPSolver.createSolver("SCIP");
+    if (solver == null) {
+      System.out.println("Could not create solver SCIP");
+      return;
+    }
     // [END solver]
 
     // [START variables]