diff --git a/histogram.cpp b/histogram.cpp
index ac765a1..d9a550d 100644
--- a/histogram.cpp
+++ b/histogram.cpp
@@ -26,9 +26,12 @@ std::vector<size_t> make_histogram(std::vector<double> numbers, size_t bin_count
 }
 
 
-void find_minmax(std::vector<double> numbers, double& min, double& max) {
+bool find_minmax(std::vector<double> numbers, double& min, double& max) {
     min = numbers[0];
     max = numbers[0];
+    if(numbers.size()==0){
+        return false;
+    }
     for (double number : numbers) {
         if (min > number) {
             min = number;
@@ -37,5 +40,5 @@ void find_minmax(std::vector<double> numbers, double& min, double& max) {
             max = number;
         }
     }
-    return;
+    return true;
 }
diff --git a/histogram.h b/histogram.h
index f613879..f182421 100644
--- a/histogram.h
+++ b/histogram.h
@@ -4,7 +4,7 @@
 #include <vector>
 
 
-void find_minmax(std::vector<double> numbers, double& min, double& max);
+bool find_minmax(std::vector<double> numbers, double& min, double& max);
 std::vector<size_t> make_histogram(std::vector<double> numbers, size_t bin_count);
 
 #endif // HISTOGRAM_H_INCLUDED