2 files changed, 17 insertions, 4 deletions
diff --git a/packages/contracts/src/2.0.0/utils/LibBytes/LibBytes.sol b/packages/contracts/src/2.0.0/utils/LibBytes/LibBytes.sol
index 01d34fa8f..504e950a8 100644
--- a/packages/contracts/src/2.0.0/utils/LibBytes/LibBytes.sol
+++ b/packages/contracts/src/2.0.0/utils/LibBytes/LibBytes.sol
@@ -457,7 +457,8 @@ library LibBytes {
     /// @return bytes4 value from byte array.
     function readBytes4(
         bytes memory b,
-        uint256 index)
+        uint256 index
+    )
         internal
         pure
         returns (bytes4 result)
diff --git a/packages/contracts/src/2.0.0/utils/SafeMath/SafeMath.sol b/packages/contracts/src/2.0.0/utils/SafeMath/SafeMath.sol
index 4413244db..190989181 100644
--- a/packages/contracts/src/2.0.0/utils/SafeMath/SafeMath.sol
+++ b/packages/contracts/src/2.0.0/utils/SafeMath/SafeMath.sol
@@ -7,8 +7,14 @@ contract SafeMath {
         pure
         returns (uint256)
     {
+        if (a == 0) {
+            return 0;
+        }
         uint256 c = a * b;
-        assert(a == 0 || c / a == b);
+        require(
+            c / a == b,
+            "UINT256_OVERFLOW"
+        );
         return c;
     }
 
@@ -26,7 +32,10 @@ contract SafeMath {
         pure
         returns (uint256)
     {
-        assert(b <= a);
+        require(
+            b <= a,
+            "UINT256_OVERFLOW"
+        );
         return a - b;
     }
 
@@ -36,7 +45,10 @@ contract SafeMath {
         returns (uint256)
     {
         uint256 c = a + b;
-        assert(c >= a);
+        require(
+            c >= a,
+            "UINT256_OVERFLOW"
+        );
         return c;
     }