diff --git a/app/Helpers/Filter/CountAttachmentsFilter.php b/app/Helpers/Filter/CountAttachmentsFilter.php
index 9ca0e79438..3103de0e54 100644
--- a/app/Helpers/Filter/CountAttachmentsFilter.php
+++ b/app/Helpers/Filter/CountAttachmentsFilter.php
@@ -64,4 +64,4 @@ class CountAttachmentsFilter implements FilterInterface
 
         return $set;
     }
-}
\ No newline at end of file
+}
diff --git a/app/Helpers/Filter/SplitIndicatorFilter.php b/app/Helpers/Filter/SplitIndicatorFilter.php
index 73116232e1..5d59ce5496 100644
--- a/app/Helpers/Filter/SplitIndicatorFilter.php
+++ b/app/Helpers/Filter/SplitIndicatorFilter.php
@@ -64,4 +64,4 @@ class SplitIndicatorFilter implements FilterInterface
 
         return $set;
     }
-}
\ No newline at end of file
+}
diff --git a/app/Services/Bunq/Object/Image.php b/app/Services/Bunq/Object/Image.php
index dc4370fcc6..11d83f9e5b 100644
--- a/app/Services/Bunq/Object/Image.php
+++ b/app/Services/Bunq/Object/Image.php
@@ -59,4 +59,4 @@ class Image extends BunqObject
         die(sprintf('Cannot convert %s to array.', get_class($this)));
     }
 
-}
\ No newline at end of file
+}
diff --git a/app/Services/Bunq/Object/LabelUser.php b/app/Services/Bunq/Object/LabelUser.php
index 2ced566153..c3eaacc5d9 100644
--- a/app/Services/Bunq/Object/LabelUser.php
+++ b/app/Services/Bunq/Object/LabelUser.php
@@ -87,4 +87,4 @@ class LabelUser extends BunqObject
     {
         die(sprintf('Cannot convert %s to array.', get_class($this)));
     }
-}
\ No newline at end of file
+}
diff --git a/app/Services/Currency/FixerIOv2.php b/app/Services/Currency/FixerIOv2.php
index eb43ba6cf9..12b9b76dbd 100644
--- a/app/Services/Currency/FixerIOv2.php
+++ b/app/Services/Currency/FixerIOv2.php
@@ -92,11 +92,13 @@ class FixerIOv2 implements ExchangeRateInterface
         }
         if (null !== $content) {
             $code = $toCurrency->code;
-            $rate = isset($content['rates'][$code]) ? $content['rates'][$code] : '0';
+            $rate = $content['rates'][$code] ?? 0;
         }
         Log::debug('Got the following rates from Fixer: ', $content['rates'] ?? []);
         $exchangeRate->rate = $rate;
-        $exchangeRate->save();
+        if ($rate !== 0) {
+            $exchangeRate->save();
+        }
 
         return $exchangeRate;
     }
diff --git a/app/Services/Internal/Destroy/CategoryDestroyService.php b/app/Services/Internal/Destroy/CategoryDestroyService.php
index 08e163313c..2f1440a513 100644
--- a/app/Services/Internal/Destroy/CategoryDestroyService.php
+++ b/app/Services/Internal/Destroy/CategoryDestroyService.php
@@ -43,4 +43,4 @@ class CategoryDestroyService
             Log::error(sprintf('Could not delete category: %s', $e->getMessage())); // @codeCoverageIgnore
         }
     }
-}
\ No newline at end of file
+}
diff --git a/app/Services/Internal/Destroy/CurrencyDestroyService.php b/app/Services/Internal/Destroy/CurrencyDestroyService.php
index 58689f349e..04cf37b279 100644
--- a/app/Services/Internal/Destroy/CurrencyDestroyService.php
+++ b/app/Services/Internal/Destroy/CurrencyDestroyService.php
@@ -45,4 +45,4 @@ class CurrencyDestroyService
         }
     }
 
-}
\ No newline at end of file
+}
diff --git a/app/Services/Internal/Update/CategoryUpdateService.php b/app/Services/Internal/Update/CategoryUpdateService.php
index 9aaa335afc..677a71d4b8 100644
--- a/app/Services/Internal/Update/CategoryUpdateService.php
+++ b/app/Services/Internal/Update/CategoryUpdateService.php
@@ -45,4 +45,4 @@ class CategoryUpdateService
         return $category;
     }
 
-}
\ No newline at end of file
+}
diff --git a/app/Services/Internal/Update/CurrencyUpdateService.php b/app/Services/Internal/Update/CurrencyUpdateService.php
index 416282f67e..c5be7786ba 100644
--- a/app/Services/Internal/Update/CurrencyUpdateService.php
+++ b/app/Services/Internal/Update/CurrencyUpdateService.php
@@ -47,4 +47,4 @@ class CurrencyUpdateService
         return $currency;
     }
 
-}
\ No newline at end of file
+}
diff --git a/database/migrations/2018_03_19_141348_changes_for_v472.php b/database/migrations/2018_03_19_141348_changes_for_v472.php
index 6d675f098e..0960d6e381 100644
--- a/database/migrations/2018_03_19_141348_changes_for_v472.php
+++ b/database/migrations/2018_03_19_141348_changes_for_v472.php
@@ -1,4 +1,5 @@
 <?php
+declare(strict_types=1);
 
 use Illuminate\Database\Migrations\Migration;
 use Illuminate\Database\Schema\Blueprint;