prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  when I log out while  I am on my profile page I get a 500
  
  
  </issue>
  <code>
  [start of euth/follows/templatetags/follow_tags.py]
  1 from django import template
  2 
  3 from .. import models
  4 
  5 register = template.Library()
  6 
  7 
  8 @register.assignment_tag()
  9 def is_following(user, project):
  10     return models.Follow.objects.filter(
  11         enabled=True,
  12         project=project,
  13         creator=user
  14     ).exists()
  15
  [end of euth/follows/templatetags/follow_tags.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/euth/follows/templatetags/follow_tags.py b/euth/follows/templatetags/follow_tags.py
  --- a/euth/follows/templatetags/follow_tags.py
  +++ b/euth/follows/templatetags/follow_tags.py
  @@ -7,8 +7,11 @@
   
   @register.assignment_tag()
   def is_following(user, project):
  -    return models.Follow.objects.filter(
  -        enabled=True,
  -        project=project,
  -        creator=user
  -    ).exists()
  +    if not user.is_anonymous():
  +        return models.Follow.objects.filter(
  +            enabled=True,
  +            project=project,
  +            creator=user
  +        ).exists()
  +    else:
  +        return False
  
verification_info: {"golden_diff": "diff --git a/euth/follows/templatetags/follow_tags.py b/euth/follows/templatetags/follow_tags.py\n--- a/euth/follows/templatetags/follow_tags.py\n+++ b/euth/follows/templatetags/follow_tags.py\n@@ -7,8 +7,11 @@\n \n @register.assignment_tag()\n def is_following(user, project):\n-    return models.Follow.objects.filter(\n-        enabled=True,\n-        project=project,\n-        creator=user\n-    ).exists()\n+    if not user.is_anonymous():\n+        return models.Follow.objects.filter(\n+            enabled=True,\n+            project=project,\n+            creator=user\n+        ).exists()\n+    else:\n+        return False\n", "issue": "when I log out while  I am on my profile page I get a 500\n\n", "before_files": [{"content": "from django import template\n\nfrom .. import models\n\nregister = template.Library()\n\n\n@register.assignment_tag()\ndef is_following(user, project):\n    return models.Follow.objects.filter(\n        enabled=True,\n        project=project,\n        creator=user\n    ).exists()\n", "path": "euth/follows/templatetags/follow_tags.py"}]}